Glossary: Options Strategy Terms

Options strategies involve precise terminology, and misunderstanding a single term can turn a hedged position into an unhedged one. This glossary covers the essential vocabulary for options strategy execution, from Greeks to spread mechanics, with definitions grounded in how each term actually affects your P&L.

TL;DR: A concise, alphabetized reference of 28 options strategy terms—each defined in practical, portfolio-relevant language with key numbers where they matter. Bookmark this and return as needed.

How to Use This Glossary

Each term below is defined with one core definition followed by the practical detail that matters for execution. Where relevant, you'll find cross-references to related terms within this glossary and links to deeper Equicurious articles on specific strategies.

The point is: definitions alone don't build competence—understanding how terms connect to each other does. Pay attention to the cross-references.

Alphabetized Terms

Assignment — The process by which an option seller is obligated to fulfill the contract terms (deliver or purchase shares). American-style equity options can be assigned at any time before expiration. Early assignment risk increases for short in-the-money calls when the remaining extrinsic value is less than an upcoming dividend (the option holder exercises to capture the dividend). After assignment, equity option exercises settle on a T+1 basis. (See also: Exercise, In-the-Money.)

At-the-Money (ATM) — An option whose strike price equals (or is nearest to) the current price of the underlying stock. ATM options carry the most time value and typically have a delta near ±0.50, meaning they have an approximately 50% probability of finishing in the money at expiration. (See also: Delta, Strike Price.)

Bear Call Spread — A credit spread constructed by selling a call at a lower strike and buying a call at a higher strike, both with the same expiration. You collect a net credit and profit if the underlying stays below the short strike. Maximum loss equals the strike width minus the net credit received, multiplied by 100 per contract. This is the upper half of an iron condor. (See also: Credit Spread, Iron Condor.)

Breakeven Point — The underlying price at which an options position produces zero profit or loss at expiration. For a long call: strike price + premium paid. For a long put: strike price − premium paid. For credit spreads, the breakeven is the short strike adjusted by the credit received. Always calculate your breakeven before entering a trade—it tells you exactly what the market needs to do for you to avoid a loss.

Bull Put Spread — A credit spread constructed by selling a put at a higher strike and buying a put at a lower strike, same expiration. You collect a net credit and profit if the underlying stays above the short strike. This is the lower half of an iron condor. A common structure targets a minimum credit-to-width ratio of one-third (33%) to ensure adequate reward-to-risk. (See also: Credit Spread, Iron Condor.)

Contract Multiplier — Each US equity option contract represents 100 shares of the underlying stock. A quoted premium of $2.50 means a total cost of $250 per contract. S&P 500 index options at the 5,000 level represent $500,000 notional per contract (100 × index level). Forgetting the multiplier is one of the most common and expensive mistakes new traders make.

Covered Call — Selling a call option against 100 shares of stock you already own, per contract. The premium received reduces your cost basis but caps your upside at the strike price plus premium collected. The Cboe S&P 500 BuyWrite Index (BXM) has historically produced lower volatility with comparable or slightly lower total returns versus the S&P 500 over multi-decade periods. (See our article on Covered Calls and Cash-Secured Puts for full strategy mechanics.)

Credit Spread — A strategy that simultaneously sells a nearer-to-the-money option and buys a farther-out-of-the-money option of the same type for a net premium received. Maximum profit is the credit collected. Maximum loss equals strike width minus credit received (times 100). A widely followed management rule: close credit spreads at 50% of maximum profit to balance win rate against holding risk. (See also: Bull Put Spread, Bear Call Spread.)

Days to Expiration (DTE) — The number of calendar days remaining until an option expires. DTE drives time decay dynamics: 30–45 DTE is the most common entry point for premium sellers, balancing theta decay rate against gamma risk. Time decay accelerates significantly inside 30–45 DTE, with the fastest decay occurring in the final 7–14 days. (See also: Theta, 0DTE.)

Delta — The rate of change in an option's price per $1 move in the underlying. Ranges from 0 to +1.0 for calls and 0 to −1.0 for puts. ATM options sit near ±0.50. Delta also serves as a rough proxy for the probability that an option finishes in the money—a 0.16-delta option has approximately an 84% chance of expiring worthless, which is why short strikes are often placed at that level. (See also: Gamma, At-the-Money.)

Exercise — The act of an option holder invoking their right to buy (call) or sell (put) the underlying at the strike price. Equity option exercises settle T+1 (updated from T+2 in May 2024). Most options are closed before expiration rather than exercised. (See also: Assignment.)

Gamma — The rate of change in delta per $1 move in the underlying. Gamma is highest for ATM options near expiration and approaches zero for deep in- or out-of-the-money options. High gamma near expiration is what makes short options dangerous in the final days—small moves in the underlying cause large swings in delta and therefore in the option's price. (See also: Delta, Gamma Squeeze.)

Gamma Squeeze — A feedback loop where rising prices force market makers hedging short call positions to buy additional shares (because delta increases), which pushes prices higher, increasing delta further. During the January 2021 GameStop event, GME rose from $39.12 to $483.00 intraday (a 1,135% move in 5 trading days) as this dynamic amplified directional moves. Options volume hit 2.4 million contracts on January 27 versus a prior 30-day average of approximately 100,000. (See also: Gamma, Delta.)

Implied Volatility (IV) — The market's forecast of the likely magnitude of a security's price movement, expressed as an annualized percentage. An IV of 30% implies a roughly 68% probability that the underlying moves within ±30% over one year. IV is a key input in option pricing—when IV is high, options are expensive; when IV is low, they're cheap. (See also: IV Rank, Vega, VIX.)

Implied Volatility Rank (IV Rank) — A measure of current IV relative to its range over the past 52 weeks. An IV rank above 50% is commonly used as a threshold for initiating premium-selling strategies (selling options when they're relatively expensive). The point is: IV alone doesn't tell you if options are cheap or expensive—IV rank provides the context. (See also: Implied Volatility.)

In-the-Money (ITM) — A call option with a strike price below the current underlying price, or a put option with a strike price above it. ITM options have intrinsic value. Short ITM calls near ex-dividend dates face elevated early assignment risk when the extrinsic value remaining is less than the dividend amount. (See also: Out-of-the-Money, At-the-Money.)

Iron Condor — A four-leg neutral strategy combining a bull put spread and a bear call spread. Maximum profit equals the total net credit received. Breakeven points are the short strikes adjusted by the total credit. Commonly structured with short strikes at approximately 0.16 delta (1 standard deviation OTM) on each side. A typical management rule: close at 50% of max profit or when the underlying approaches within 50% of the distance to a short strike. (See also: Bull Put Spread, Bear Call Spread, Credit Spread.)

Naked Option — A short option position without an offsetting position in the underlying stock or a further-OTM option. Regulation T margin requirements for naked short options: the greater of 20% of underlying value minus OTM amount plus premium, or 10% of underlying value plus premium. Risk management guidelines suggest avoiding naked short options entirely when VIX exceeds 35. (See also: Credit Spread.)

Out-of-the-Money (OTM) — A call option with a strike price above the current underlying price, or a put option with a strike price below it. OTM options have no intrinsic value—their entire premium is time value. Short options placed at 0.16 delta (approximately 1 standard deviation OTM) target an ~84% probability of expiring worthless. (See also: In-the-Money, Delta.)

Premium — The price paid (by the buyer) or received (by the seller) for an options contract. Premium reflects intrinsic value plus time value. Remember the multiplier: a $2.50 quoted premium costs $250 per contract. Premium expands dramatically during volatility spikes—during the March 2020 COVID crash, option premiums expanded 3–5× across most strikes. (See also: Contract Multiplier, Implied Volatility.)

Protective Put — Buying a put option on stock you already own to set a floor on losses. The effective floor price equals the put strike minus the premium paid. The cost of this insurance rises sharply during high-volatility periods (precisely when you want it most). (See our article on Protective Puts and Collars for implementation details.)

Rolling — Closing an existing options position and simultaneously opening a new one, typically at a different expiration (and sometimes a different strike). A common management rule: when short options are inside 14 DTE and haven't hit 50% of max profit, roll to the next monthly cycle (30–45 DTE) for the same or better credit. The rule that survives: rolling is a risk management tool, not a way to avoid losses indefinitely. (See also: Days to Expiration.)

Strike Price — The specified price at which an option can be exercised—the price at which you buy (call) or sell (put) the underlying. Strike selection determines your risk-reward profile, delta exposure, and probability of profit. (See also: At-the-Money, In-the-Money, Out-of-the-Money.)

Theta — The rate of time decay in an option's price per calendar day. An ATM option with 30 DTE on a $100 stock might lose approximately $0.05–$0.15 per day. Theta decay accelerates inside 30–45 DTE, with the fastest erosion in the final 7–14 days. Why this matters: premium sellers profit from theta, so they target the steepest part of the decay curve. (See also: Days to Expiration, Premium.)

Vega — The change in an option's price per 1-percentage-point change in implied volatility. A vega of 0.12 means the option price changes $0.12 for each 1% IV move. Vega is highest for longer-dated, ATM options. During the March 2020 volatility spike, VIX rose from 13.68 to 82.69 (a 504% increase in 18 trading days)—vega exposure drove enormous P&L swings even for positions that were directionally neutral. (See also: Implied Volatility, VIX.)

VIX (Cboe Volatility Index) — A measure of the market's expectation of 30-day S&P 500 volatility, calculated from SPX option prices. The long-term average (1990–2025) sits at approximately 19–20. Below 15 is generally considered low volatility; above 25 is elevated. The VIX closed at 82.69 on March 16, 2020—the highest closing level ever recorded. (See also: Implied Volatility.)

0DTE (Zero Days to Expiration) — Options expiring on the same day they are traded. SPX 0DTE options trade every business day. These grew from approximately 5% of total SPX options volume in early 2022 to over 45% by late 2024, averaging over 1.5 million contracts daily by Q4 2024. Theta decay is near-instantaneous and gamma risk is extreme—these are precision tools, not beginner strategies. (See also: Days to Expiration, Theta, Gamma.)

Position Sizing and Risk Rules (Quick Reference)

Before applying any of these terms in a live portfolio, anchor to these widely cited risk guidelines:

• Essential (high ROI):

  • Risk no more than 1–5% of total portfolio on any single options position
  • Target credit-to-width ratio of at least 33% on vertical credit spreads
  • Close credit strategies at 50% of max profit to improve win rate
  • Monitor all short options daily inside 14 DTE

• High-impact (workflow):

  • Use IV rank above 50% as a threshold before selling premium
  • Reduce position sizes by 50% when VIX exceeds 30 or underlying IV rank exceeds 80%
  • Set a mechanical stop at 2× credit received for defined-risk spreads

• Optional (advanced):

  • Check extrinsic value against upcoming dividends on short ITM calls before ex-date
  • Track 0DTE exposure separately from your core options book

Closing Note

This glossary reflects definitions and data from the Options Clearing Corporation (OCC), Cboe Global Markets, the SEC, and FINRA as of February 2026. Options terminology and market conventions evolve—new products (like 0DTE options) and updated settlement cycles (T+1 for exercises) change how these terms apply in practice.

Your next step: Pick three terms from this glossary that you encounter most often in your trading and re-read their full definitions along with the cross-references. Understanding how delta → gamma → assignment risk connect as a chain will do more for your risk management than memorizing 28 isolated definitions.

Subscribe for glossary updates as new terms and strategy mechanics are added.

Sources: OCC Options Education (optionseducation.org), Cboe Global Markets Education (cboe.com/education), SEC Investor Bulletin on Options, FINRA Options Rules and Guidance, OCC Characteristics and Risks of Standardized Options (ODD), Cboe VIX Index Methodology.