Glossary
Glossary
A plain-English, alphabetically-ordered glossary of the terms used throughout this knowledge base, defined the way premium-selling traders use them. Definitions favor the mechanical, probability-and-premium framing at the heart of this method. Where a term has a dedicated section, a cross-link in parentheses points to it. Substantive or quantitative claims carry an inline evidence tag of the form ; plain vocabulary definitions are left untagged as standard options terminology.
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A
Assignment — when the seller of an option is obligated to fulfill the contract: a short call seller must deliver (sell) 100 shares at the strike, and a short put seller must take (buy) 100 shares at the strike. Assignment is the counterpart to exercise and is assigned to short holders, typically at random by the OCC. (see ../22_mechanics/)
At-the-money (ATM) — an option whose strike is at (or nearest to) the current price of the underlying. ATM options carry the most extrinsic value and the highest gamma and theta, and sit near a ~50 delta. (see ../01_options_basics/)
ATM straddle — the combination of an at-the-money call and put used by premium sellers as a fast read of the market-implied expected move: the straddle's price is a close approximation of the ±1 expected move through that expiration. (see ../03_implied_volatility/)
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B
Backwardation — a term-structure state in which near-dated implied volatility is higher than longer-dated IV, typically during stress or around a known event. The opposite of contango; signals the market expects elevated short-term movement. (see ../03_implied_volatility/, ../17_volatility_trading/)
Beta weighting — expressing the directional exposure (delta) of every position in terms of a common benchmark, usually SPY, so the whole portfolio's net delta can be read on one scale. Active option sellers beta-weight to manage aggregate directional risk and stay roughly delta-neutral. (see ../06_portfolio_management/, ../19_risk_management/)
Backwardation vs. contango — see the individual entries.
Bid-ask spread — the gap between the highest price a buyer will pay (bid) and the lowest a seller will accept (ask). A tight spread signals a liquid, efficiently-priced option; a wide spread is a hidden cost and a clear red flag for poor liquidity. (see ../23_platform_usage/, ../22_mechanics/)
Breakeven — the underlying price(s) at which a position produces zero profit or loss at expiration. For a short put it is strike minus credit; for a short call, strike plus credit; a strangle has two breakevens (lower put strike − credit, upper call strike + credit). (see ../01_options_basics/, ../09_strangles/)
Broken wing butterfly (BWB) — a butterfly with unequal wing widths that skews the structure to one side, often taken for a net credit so there is little or no risk on the opposite side. It serves as a directional, defined-risk premium-selling structure. (see ../08_defined_risk/, ../14_ratio_spreads/)
Buying power (BP) — the dollar amount in an account available to open new positions. In a margin account it exceeds cash; trades consume it via buying power reduction. (see ../06_portfolio_management/, ../16_small_accounts/)
Buying power reduction (BPR) — the amount of buying power a specific trade ties up while it is open, i.e., its margin requirement. The premium-selling approach sizes trades by BPR, commonly keeping any one position to a small percent of net liq. (see ../20_position_sizing/, ../06_portfolio_management/)
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C
Calendar spread — selling a near-term option and buying a longer-term option at the same strike. It is a long-vega, positive-theta structure that profits from time decay in the front month and/or a rise in IV; it is favored in low IV environments. (see ../12_calendar_spreads/)
Call — an option giving its owner the right to buy 100 shares of the underlying at the strike before/at expiration. Long calls profit when the underlying rises; short calls collect premium and profit when it does not rise past the strike. (see ../01_options_basics/)
Cash-secured put — selling a put while holding enough cash to buy the 100 shares if assigned. It expresses a willingness to own the stock at the strike (effectively at strike − credit) and is the entry leg of the wheel. (see ../07_short_premium/, ../16_small_accounts/)
Contango — a term-structure state in which longer-dated implied volatility is higher than near-dated IV; the normal, calm-market shape of the VIX futures curve. The opposite of backwardation. (see ../03_implied_volatility/, ../17_volatility_trading/)
Covered call — owning 100 shares and selling a call against them to collect premium and define an exit price. A core income strategy for premium sellers and the second leg of the wheel; caps upside at the short strike in exchange for the credit. (see ../07_short_premium/)
Credit — cash received for opening a position (you are paid to take on the obligation). Selling premium produces a credit; because the strategy is predominantly net-short premium, most entries are credits. (see ../07_short_premium/, ../11_credit_spreads/)
Credit spread — a defined-risk vertical entered for a net credit: sell a closer-to-the-money option and buy a further option of the same type and expiration. Max profit is the credit; max loss is the strike width minus the credit. (see ../11_credit_spreads/, ../08_defined_risk/)
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D
Debit — cash paid to open a position. Buying options or entering a debit spread costs a debit; the debit is the maximum loss on a long defined-risk trade. (see ../08_defined_risk/)
Debit spread — a defined-risk vertical entered for a net debit: buy a closer-to-the-money option and sell a further one of the same type and expiration. Max loss is the debit; max profit is the width minus the debit. (see ../11_credit_spreads/, ../08_defined_risk/)
Defined risk — a position whose maximum possible loss is known and capped at entry, because long options bound the short options (e.g., spreads, iron condors, butterflies). Preferred in smaller accounts and for tail protection. (see ../08_defined_risk/, ../16_small_accounts/)
Delta — the rate of change of an option's price per $1 move in the underlying; also a rough proxy for the probability of finishing in-the-money and the share-equivalent directional exposure of a position. A 30-delta option moves ~$0.30 per $1 and has roughly a 30% chance of expiring ITM. (see ../04_option_pricing/, ../02_probability/)
Diagonal spread — selling a near-term option and buying a longer-term option at a different strike (a calendar with different strikes). Combines time-decay and directional exposure; the poor man's covered call is a long-call diagonal. (see ../13_diagonals/)
DTE (days to expiration) — the number of calendar days until an option expires. The research centers entries near 45 DTE and management near 21 DTE (see those entries). (see ../05_trade_management/)
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E
Early assignment — assignment on a short option before expiration. It is rare for OTM options, driven mainly by short calls going ex-dividend or by deep-ITM options near expiration; long options are never assigned early because exercise is the holder's choice. (see ../22_mechanics/, ../21_trade_adjustments/)
Ex-dividend risk — the elevated chance of early assignment on a short in-the-money call the day before a stock goes ex-dividend, when the dividend exceeds the call's remaining extrinsic value and an owner exercises to capture the payout. (see ../22_mechanics/)
Exercise — the action by an option owner (the long) of invoking the contract: buying shares at the strike (call) or selling shares at the strike (put). Exercise on the long side produces assignment on the short side. (see ../22_mechanics/)
Expected move — the market-implied ±1 standard-deviation price range over a period, approximated by `Stock Price × IV × √(DTE/365)` (≈68% of outcomes inside it) and read quickly off the ATM straddle. Short strikes are placed relative to it. (see ../03_implied_volatility/, ../02_probability/)
Expiration — the date and time an option contract ceases to exist; afterward it is either exercised/assigned (if ITM) or expires worthless (if OTM). Standard equity options expire on Fridays; many products also list weeklies and dailies. (see ../01_options_basics/, ../22_mechanics/)
Extrinsic value — the portion of an option's price beyond intrinsic value, i.e., its time-and-volatility premium. It is what option sellers collect and what decays to zero by expiration via theta. (see ../04_option_pricing/, ../07_short_premium/)
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F
45 DTE — the days-to-expiration window (~45) where the research found the best balance of premium collected versus risk for short-premium entries; long enough to harvest meaningful theta, short enough to limit exposure. (see ../05_trade_management/, ../07_short_premium/)
50% profit target — the house rule of closing a short-premium trade once about half the initial credit has been captured, rather than holding to expiration; studies found this improves risk-adjusted return and win consistency. (see ../05_trade_management/)
Futures option — an option whose underlying is a futures contract (e.g., /ES, /CL, /GC). These are cash-efficient via SPAN margin, deliver into a future on exercise, and (cash-settled index/futures options) receive Section 1256 tax treatment. (see ../15_futures_options/)
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G
Gamma — the rate of change of delta per $1 move in the underlying; it measures how fast directional exposure shifts. Gamma is highest for ATM, near-expiration options, which is the core reason traders manage positions before "gamma risk" spikes. (see ../04_option_pricing/, ../19_risk_management/)
GTC order (good-til-canceled) — a resting order that stays live across sessions until it fills or is canceled. A common workflow is to place a GTC closing order at the 50% profit target right after entry so winners are taken automatically. (see ../05_trade_management/, ../23_platform_usage/)
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H
Historical / realized volatility — the actual, backward-looking volatility the underlying has exhibited over a past window, computed from price returns. Comparing it to implied volatility reveals the volatility risk premium; IV usually sits above realized. (see ../03_implied_volatility/, ../17_volatility_trading/)
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I
Implied volatility (IV) — the forward-looking, annualized volatility backed out of an option's market price; the single most important input in the premium-selling framework. High IV means richer premium and is the green light to sell. (see ../03_implied_volatility/, ../04_option_pricing/)
In-the-money (ITM) — an option with intrinsic value: a call whose strike is below the underlying, or a put whose strike is above it. ITM options carry assignment/exercise consequences at expiration. (see ../01_options_basics/)
Intrinsic value — the in-the-money amount of an option: `max(0, underlying − strike)` for a call, `max(0, strike − underlying)` for a put. It is the part of premium that is not time value. (see ../04_option_pricing/)
Inverting — an adjustment in which the tested side of a strangle is rolled past the untested side, so the call strike ends up below the put strike. A challenged strangle may be inverted to collect more credit and reduce loss while waiting for mean reversion. (see ../21_trade_adjustments/, ../09_strangles/)
Iron butterfly — a defined-risk, four-leg structure: a short ATM straddle bounded by long wings (a short call spread and short put spread sharing the same short strike). Higher credit and lower probability of profit than an iron condor; profits if the underlying pins the center. (see ../10_iron_condors/, ../08_defined_risk/)
Iron condor — a defined-risk, four-leg structure combining an out-of-the-money short put spread and short call spread for a net credit. It profits if the underlying stays between the short strikes; the flagship neutral, high-IV, defined-risk trade. (see ../10_iron_condors/, ../08_defined_risk/)
IV percentile (IVP) — the percentage of days over the past 52 weeks on which IV was lower than today's IV. An IVP of 80% means IV has been this high only 20% of the past year; it is less sensitive to single spikes than IV Rank. (see ../03_implied_volatility/)
IV rank (IVR) — where current IV sits within its 52-week high–low range: `(current IV − 52-wk low) / (52-wk high − 52-wk low)`. Premium sellers generally favor selling when IVR is high (often cited as ≥ ~30–50). (see ../03_implied_volatility/)
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J
Jade lizard — a short put plus a short out-of-the-money call spread, structured so the total credit exceeds the call spread's width, which eliminates upside risk entirely. A bullish-to-neutral, high-IV premium play. (see ../14_ratio_spreads/, ../08_defined_risk/)
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L
LEAPS — Long-Term Equity AnticiPation Securities: options with expirations roughly nine months to multiple years out. Long, deep-ITM LEAPS calls serve as lower-cost stock substitutes (e.g., in a poor man's covered call). (see ../13_diagonals/)
Liquidity — how easily an option can be traded at a fair price, judged by tight bid-ask spreads, high volume, and high open interest. Trading only liquid underlyings keeps fills efficient and exits reliable. (see ../23_platform_usage/, ../22_mechanics/)
Long — holding a position you bought; you own the contract or shares and benefit from a favorable move (long call gains as price rises, long put gains as price falls). The opposite of short. (see ../01_options_basics/)
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M
Managing winners — the practice of proactively closing profitable short-premium trades early (commonly at the 50% profit target) instead of holding to expiration; a foundational rule shown to improve consistency. (see ../05_trade_management/)
Max loss — the largest possible loss on a position. It is defined and capped for spreads/condors/butterflies (e.g., width − credit) and theoretically large or undefined for naked options. (see ../08_defined_risk/, ../19_risk_management/)
Max profit — the largest possible gain on a position. For short-premium trades it is the credit received; for long defined-risk trades it is the width minus the debit. (see ../08_defined_risk/)
Mean reversion — the tendency of implied volatility (and the VIX) to fall back toward an average after spiking. It is the theoretical engine behind selling premium when IV is high — high IV is expected to contract. (see ../03_implied_volatility/, ../17_volatility_trading/)
Micro future — a smaller-notional futures contract (e.g., /MES, /MNQ, /MCL) sized at a fraction (often 1/10) of the standard contract, letting smaller accounts trade futures and futures options with proportionally less buying power. (see ../15_futures_options/, ../16_small_accounts/)
Mid price — the midpoint of the bid and ask, the natural starting point for a limit order. Orders are typically worked at or near the mid and adjusted toward the natural price to get filled on liquid options. (see ../23_platform_usage/, ../22_mechanics/)
Moneyness — an option's strike relative to the underlying price, categorized as ITM, ATM, or OTM. Moneyness drives the split between intrinsic and extrinsic value and the option's delta. (see ../01_options_basics/, ../04_option_pricing/)
Multiplier — the number of underlying units one option controls; 100 shares for standard equity options. Premiums and Greeks are quoted per-share, so a $1.50 option costs $150, and a 0.30 delta represents 30 share-equivalents. (see ../01_options_basics/, ../22_mechanics/)
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N
Naked option — a short option not backed by stock or a long option, leaving undefined (large, theoretically unlimited for calls) risk. Naked premium is sold in larger margin accounts for capital efficiency, sized carefully. (see ../07_short_premium/, ../19_risk_management/)
Net liquidity (net liq) — the real-time liquidation value of an account: cash plus the current value of all positions, i.e., what the account is worth if everything closed now. Positions and risk are sized as a percentage of net liq. (see ../06_portfolio_management/, ../20_position_sizing/)
Notional value — the full dollar value of the underlying a position controls (e.g., for a future, contract size × price × multiplier). It captures true exposure, which can dwarf the margin posted. (see ../15_futures_options/, ../19_risk_management/)
Number of occurrences — the emphasis on sample size: trading often enough that probabilistic edges (POP, the volatility risk premium) can play out over many trades rather than being swamped by the variance of any single one. (see ../02_probability/, ../18_research_findings/)
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O
0DTE — a "zero days to expiration" option, traded on its expiration day. Popular on index products (SPX) with daily listings; very high gamma and rapid theta make these fast-moving, higher-variance trades. (see ../15_futures_options/, ../17_volatility_trading/)
Open interest — the total number of an option contract's positions currently open. Alongside volume, high open interest signals liquidity and tighter spreads; it is worth screening for before trading a strike. (see ../23_platform_usage/, ../22_mechanics/)
Out-of-the-money (OTM) — an option with no intrinsic value: a call whose strike is above the underlying, or a put whose strike is below it. OTM short options are the bread-and-butter of premium selling. (see ../01_options_basics/)
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P
Pin risk — the uncertainty near expiration when the underlying sits right at a short strike, leaving the seller unsure whether they will be assigned and thus what overnight position (long/short shares) they will hold. It is avoided by closing or rolling before expiration. (see ../22_mechanics/, ../21_trade_adjustments/)
Poor man's covered call (PMCC) — a long-call diagonal that mimics a covered call using a long, deep-ITM LEAPS call as a stock substitute while selling shorter-dated calls against it. Capital-efficient alternative to owning 100 shares. (see ../13_diagonals/, ../16_small_accounts/)
Portfolio margin — a risk-based margin system (for qualifying larger accounts) that sets requirements on the net risk of the whole portfolio rather than position-by-position, usually freeing substantial buying power versus Reg-T. (see ../06_portfolio_management/)
Premium — the price of an option, paid by the buyer and received by the seller, equal to intrinsic plus extrinsic value and quoted per share (×100 for total cost). "Selling premium" is shorthand for the core methodology. (see ../01_options_basics/, ../07_short_premium/)
Probability of profit (POP) — the estimated likelihood a trade is profitable by at least \$0.01 at expiration. For a single short option it is approximately `1 − (credit-implied breakeven probability)`; selling further OTM and collecting more credit raises POP. (see ../02_probability/)
Probability of touch — the chance the underlying touches a given strike at any point before expiration; it is roughly twice the probability of finishing beyond that strike (≈ 2× the OTM option's delta). Always higher than probability of ITM, which is why tested strikes get challenged more often than they finish ITM. (see ../02_probability/)
Put — an option giving its owner the right to sell 100 shares of the underlying at the strike before/at expiration. Long puts profit when the underlying falls; short puts collect premium and profit when it does not fall below the strike. (see ../01_options_basics/)
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R
Ratio spread — buying and selling unequal numbers of options of the same type and expiration (e.g., buy 1 / sell 2), usually for a credit. It blends directional bias with premium selling and can carry undefined risk on the heavier short side. (see ../14_ratio_spreads/)
Realized volatility — see Historical / realized volatility.
Reg-T margin — the standard Federal Reserve Regulation T margin framework that sets fixed, position-level requirements (e.g., a defined percentage of notional for naked options, width − credit for spreads). The default for most retail margin accounts. (see ../06_portfolio_management/)
Rho — the rate of change of an option's price per 1% change in interest rates. It is the least-watched Greek for short-dated retail options because rate moves are slow relative to typical holding periods. (see ../04_option_pricing/)
Rolling — closing an existing position and simultaneously reopening a similar one at a later expiration and/or different strike, usually to collect more credit, buy time, and reduce risk on a tested trade. (see ../21_trade_adjustments/, ../05_trade_management/)
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S
Section 1256 — the U.S. tax rule covering futures, options on futures, and cash-settled index options (e.g., SPX, NDX, RUT, VIX), which receive blended 60/40 treatment (60% long-term, 40% short-term) and are marked to market at year-end. (see ../15_futures_options/)
Short — holding a position you sold without owning it first; you collect premium and carry the corresponding obligation (short call may have to deliver shares, short put may have to buy them). The opposite of long; the default posture in premium selling. (see ../01_options_basics/, ../07_short_premium/)
SPAN margin — the Standard Portfolio Analysis of Risk system used for futures and futures options, which sets margin from a risk-array scenario analysis of the position. It is generally more capital-efficient than Reg-T for futures exposure. (see ../15_futures_options/)
Standard deviation (1 SD) — the statistical measure mapped onto the expected move: ±1 SD captures ~68% of outcomes, ±2 SD ~95%. Selling a ~16-delta strike places the short at roughly the 1-SD boundary. (see ../02_probability/, ../03_implied_volatility/)
Straddle — buying (long) or selling (short) a call and a put at the same ATM strike and expiration. Short straddles collect maximum premium on a neutral view, and the long straddle's price reads as the expected move. (see ../09_strangles/, ../17_volatility_trading/)
Strangle — buying or selling an OTM call and an OTM put at different strikes, same expiration. The short strangle is a flagship undefined-risk neutral trade, profiting if the underlying stays between the strikes through time decay. (see ../09_strangles/)
Strike (strike price) — the fixed price at which an option can be exercised or assigned. Strike selection (by delta or distance from the expected move) is how traders dial in probability of profit and credit. (see ../01_options_basics/, ../02_probability/)
Skew — see Volatility skew.
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T
Term structure — the curve of implied volatility across expiration dates for one underlying. Its normal upward slope (contango) and occasional inversion (backwardation) inform which expirations are richest to sell. (see ../03_implied_volatility/, ../17_volatility_trading/)
Theta — the rate at which an option loses value per day from time decay, holding all else constant. It is the seller's tailwind: short-premium positions are positive-theta and earn the extrinsic value as it bleeds away. (see ../04_option_pricing/, ../07_short_premium/)
Theta decay — the accelerating erosion of an option's extrinsic value as expiration nears, fastest in the final weeks for ATM options. Capturing it is the core profit mechanism of premium selling. (see ../04_option_pricing/, ../05_trade_management/)
The wheel — a cyclical strategy: sell a cash-secured put, and if assigned the shares, sell covered calls against them until called away, then repeat. A systematic way to get paid while entering and exiting stock. (see ../07_short_premium/, ../16_small_accounts/)
21 DTE management — the rule of taking action on a short-premium trade (close, roll, or otherwise manage) around 21 days to expiration, whether or not the profit target was hit, to sidestep the sharp rise in gamma risk in the final weeks. (see ../05_trade_management/, ../19_risk_management/)
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U
Undefined risk — a position whose maximum loss is not capped, such as a naked short call (theoretically unlimited) or short strangle/put. Undefined-risk trades are taken for capital efficiency and higher POP, but only with disciplined sizing. (see ../07_short_premium/, ../19_risk_management/)
Untested side — in a two-sided trade (strangle, iron condor), the side the underlying is moving away from and is therefore unlikely to be challenged. The untested side is often rolled toward the price to collect more credit and defend the tested side. (see ../21_trade_adjustments/, ../09_strangles/)
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V
Vega — the change in an option's price per one-point change in implied volatility. Short-premium positions are negative-vega (they profit when IV falls), which is why sellers enter when IV is high and expected to mean-revert. (see ../04_option_pricing/, ../03_implied_volatility/)
Vertical spread — two options of the same type and expiration at different strikes, one long and one short; the building block of credit and debit spreads. Defines risk by capping both sides. (see ../11_credit_spreads/, ../08_defined_risk/)
VIX — the Cboe Volatility Index, the market's 30-day implied volatility of the S&P 500 ("the fear gauge"). It serves as the broad IV regime signal; high VIX means richer premium across the board. (see ../03_implied_volatility/, ../17_volatility_trading/)
Volatility risk premium (VRP) — the persistent tendency for implied volatility to exceed subsequently-realized volatility, meaning options are on average priced richer than the movement that follows. It is the structural edge harvested by selling premium. (see ../17_volatility_trading/, ../18_research_findings/)
Volatility skew — the pattern of differing implied volatilities across strikes at one expiration; in equities, downside puts typically carry higher IV than upside calls (put skew) because of crash-hedging demand. It affects which strikes offer the best premium. (see ../03_implied_volatility/, ../17_volatility_trading/)
Volume — the number of an option contract's transactions during the session. Together with open interest it gauges liquidity; high-volume strikes are favored for tight spreads and easy fills. (see ../23_platform_usage/, ../22_mechanics/)
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_Evidence-labeled per the Project Charter. Education only, not financial advice._