Gamma
Gamma is a second order Greek that measures the rate of change in an option delta for a one unit move in the underlying asset. It essentially represents the acceleration of delta as the underlying price fluctuates.
Options with high gamma, typically those near the money and close to expiration, experience rapid changes in their delta. This makes gamma a critical risk factor for market makers who must constantly rebalance their hedges to remain delta neutral.
High gamma positions can lead to significant gains or losses in very short timeframes. In volatile crypto markets, gamma risk can be extreme, leading to liquidity crunches if market participants are forced to buy or sell the underlying asset to hedge their gamma exposure.
Understanding gamma is essential for sophisticated traders who manage portfolios with multiple option legs. It highlights the non-linear nature of option risk compared to holding the underlying asset directly.