GEX Terminology: The Complete GammaContext Glossary

Published by Cristian Ibáñez

This guide brings together, in one place, every term you'll run into across any GammaContext article or screen. Fourteen concepts, organized into three categories: options and gamma exposure fundamentals, the levels you see on the price map, and the two market regimes. Use it as a quick reference while you read the rest of the GEX cluster, or as your starting point if you just arrived at GammaContext.

Each term is defined on its own, self-contained. You don't need to read the whole guide top to bottom: jump straight to the term you're looking for and come back whenever you need it.

Options and Gamma Exposure Fundamentals

These are the foundations the entire GEX map is built on. They're standard terms from the options industry, the same ones you'll find in any serious source on the topic.

Gamma

Gamma is the Greek that measures how fast an option's Delta changes as the underlying's price moves. CME Group (2026) describes it as Delta's acceleration. Investopedia defines it the same way, as the sensitivity of an option's Delta to movements in the underlying. The larger the aggregate Gamma at a strike, the larger the hedge dealers need to adjust there, and that hedge is where the level map comes from.

Delta

Delta measures how much an option's price changes for every point the underlying moves. It ranges from 0 to 1 for calls and from -1 to 0 for puts. CME Group describes it as the option's directional exposure to the price of the underlying. Delta is the foundation delta hedging is built on: every hedge exists to keep a book's total delta close to zero.

Delta Hedging

Delta hedging is the process a dealer uses to adjust its options inventory and neutralize the directional risk of its position. According to Investopedia (2026), it's the strategy market makers use to keep their delta exposure close to zero, buying or selling the underlying as price moves. The Options Industry Council (OIC), the educational arm of OCC, describes this constant hedging as a standard part of how options market makers operate. That constant adjustment is exactly the pressure GEX sums up and turns into a map.

GEX (Gamma Exposure)

GEX measures how much options hedging exists in the market and which direction that hedging pushes on the price of the underlying. It's an aggregate number: it combines the behavior of thousands of options positions into a single indicator you can read at a glance. It's the foundation for everything else in this guide. The full definition, with examples, lives in What Is Gamma Exposure (GEX).

Net GEX

Net GEX is the result of summing call and put GEX at each strike, point by point across the price axis. It shows up as a bar chart: the zero crossing marks the Flip, and the largest bars mark the Call Wall and Put Wall. A study by Ni, Pearson, Poteshman, and White (2021), published in The Review of Financial Studies, found evidence that this aggregate market maker hedging has a measurable impact on the price of the underlying. See the full breakdown in Net GEX: How to Read the Map.

Structural and Intraday Levels

These are GammaContext's own level names. Each one maps to a concrete point on the price axis, derived from aggregate Net GEX.

Figure 1. GEX terminology levels plotted over a price curve: Flip, Call Wall, Put Wall, and Long-wall.

Flip

The Flip is the price where total market Net GEX changes sign. It marks the boundary between the Long Gamma Regime and the Short Gamma Regime. It's the single most important reference line on the map after price itself: the market's expected behavior changes depending on which side of it price sits. Go deeper in Gamma Flip: The Level Where the Regime Changes.

Call Wall

The Call Wall is the strike with the heaviest concentration of call gamma, typically above the current price. It acts as structural resistance: dealer hedging tends to sell there, which slows down rallies. Together with the Put Wall, it forms the most stable pair of structural levels on the map. The full breakdown lives in Call Wall and Put Wall: The Structural Levels.

Put Wall

The Put Wall is the strike with the heaviest concentration of put gamma, typically below the current price. It acts as structural support: dealer hedging tends to buy there, which slows down declines. It updates less often than intraday levels, which makes it a stable reference across several sessions in a row.

Long-wall

The Long-wall is an intraday level where hedging tends to push back against price, generating short-term pauses or turns. It shows up where positioning in same-day expiring options concentrates most heavily, and its effect is to defend that level as price approaches. When it lines up with the Call Wall or Put Wall, it forms a double wall, carrying more weight than either level on its own.

Short-fuel

The Short-fuel is an intraday zone where, if price breaks through it, the move tends to extend harder in that direction. Its behavior is the opposite of the Long-wall: while the Long-wall pushes price back, the Short-fuel releases movement once it breaks. Telling which of the two levels sits nearby completely changes how you read a range break.

Call Resistance and Put Support

Call Resistance and Put Support are the short-term levels with the heaviest concentration of calls and puts, respectively, in the nearest expirations. They work as an additional resistance and support reference for the session. When they line up with the Call Wall and Put Wall, they help confirm those structural levels aren't noise, but a zone defended across multiple timeframes at once.

GEX Levels 1-10

GEX Levels 1 through 10 are secondary gamma levels, ranked by magnitude, where 1 is the strongest. They're useful for locating intraday turns or setting short-range targets within the range the Call Wall, Put Wall, and Flip already define.

Quick Reference Table

Level	Category	Reads as
Flip	Regime-change level	Boundary between the two regimes
Call Wall	Structural level	Resistance
Put Wall	Structural level	Support
Long-wall	Intraday level	Rejection / pause
Short-fuel	Intraday level	Acceleration if broken
Call Resistance	Secondary intraday level	Short-term resistance
Put Support	Secondary intraday level	Short-term support
GEX Levels 1-10	Secondary levels	Intraday turns / short-range targets
Long Gamma Regime	Regime	Range, compressed volatility
Short Gamma Regime	Regime	Trend, expanded volatility

Market Regimes

The sign of Net GEX defines the market's regime at a given moment. It's the highest-level distinction across the entire GEX map.

Long Gamma Regime

The Long Gamma Regime is the regime where price sits above the Flip and market GEX is positive. Dealer hedging buys on dips and sells on rallies, dampening the move. The typical result is range-bound trading, with compressed volatility and a tendency to revert toward the center. Go deeper in Long Gamma vs. Short Gamma Regime.

Short Gamma Regime

The Short Gamma Regime is the regime where price sits below the Flip and market GEX is negative. Dealer hedging sells on dips and buys on rallies, reinforcing the move already in progress. The typical result is trending price action, with expanded volatility and wider moves.

How to Use This Glossary Day to Day

You don't need to memorize all fourteen terms to trade with GammaContext. The most practical way to use this guide is as a quick lookup: whenever an article, an alert, or a dashboard screen mentions a name you don't recall, come back here and search for the matching H3.

Over time, three terms become part of your daily routine naturally: the regime (Long Gamma or Short Gamma), the Flip as a context reference, and the nearest Call Wall or Put Wall. The rest of the terms, especially intraday levels like the Long-wall and Short-fuel, become relevant as you sharpen your read of the map session by session.

Frequently Asked Questions About GEX Terminology

What's the difference between the Call Wall and the Long-wall? The Call Wall is a structural level, calculated using data from multiple expirations and more stable across sessions. The Long-wall is an intraday level, calculated from options expiring that same day, and it can move faster from one session to the next.

Does the Short-fuel always mean price is going to break through? No. The Short-fuel describes what happens if price breaks that level: the move tends to extend. It doesn't predict that the break will happen, it only describes the expected dynamic if it does.

Why does GammaContext use its own names like Call Wall, Put Wall, and Long-wall? Because they're short, consistent names that match what you see on the dashboard. Generic industry terms (Gamma, Delta, GEX, Net GEX) stay exactly as they are, since they're already the standard and don't need a rebrand.

Do GEX Levels 1-10 replace the Call Wall and Put Wall? No. The Call Wall and Put Wall are the two primary structural levels. GEX Levels 1-10 are additional secondary levels, useful for fine-tuning turns within the range the Call Wall, Put Wall, and Flip already define.

Can the Long Gamma Regime and Short Gamma Regime switch within the same day? Yes. The regime changes every time price crosses the Flip, and that can happen more than once in a single session if price trades near that level.

Do I need to understand options fundamentals to use the GEX map? It's not required. You can read the map directly from the levels (Flip, Call Wall, Put Wall, Long-wall, Short-fuel). Fundamentals like Gamma and delta hedging help you understand why those levels exist, but they're not a requirement to use them.

How often is this glossary updated? It's reviewed every time a new term is added to the GammaContext map, so the public terminology always matches what you see in the product.

Keep Exploring the GEX Cluster

This guide works as the reference map for the whole cluster. If you'd rather go deeper article by article, here's the recommended order:

• What Is Gamma Exposure (GEX): the foundational guide, the starting point of the cluster.
• Gamma Flip: The Level Where the Regime Changes: the most important level after price itself.
• Call Wall and Put Wall: The Structural Levels: the two walls that frame the range.
• Net GEX: How to Read the Map: how the bar chart behind every level gets built.
• Long Gamma vs. Short Gamma Regime: the two regimes, with the full detail on each.

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About Cristian Ibáñez: Cristian is CEO & Founder of SiomTrading, Lauz and GammaContext. He's an intraday algorithmic trader in Chicago futures. He has spent years building trading tools and gamma exposure systems. He leads the SiomTrading community, with more than 1,900 traders trained. Connect with Cristian on LinkedIn.