21.
Delta is changing the price of the option per unit change in the price of the underlying asset.
Gama is defined as change in delta Based on the Per unit price change in the underlying asset.
Theta is defined as change in the price of the option per unit change in time to expiration.
Vega is defined as change in the price of the option per unit change in the implied volatility of the option
Rho is defined as the change in the price of the option per unit change in the risk free interest rate.