Subgroup of option Greeks.
Includes the Greeks which are first derivatives of option price: delta, theta, vega, rho.
Excludes gamma, which is a second order Greek, and other higher order Greeks.
See Option Greeks Tutorial and how to calculate Greeks in Excel.
List of First Order Greeks
Delta = Measure of sensitivity of option price to small changes in underlying price. Sometimes also used as proxy for the probability of expiring in the money.
Rho = Sensitivity of option price to small changes in interest rate.
Theta = Sensitivity of option price to passage of time (small changes in time to expiration). Measure of time decay.
Vega = Also kappa. Measures sensitivity of option price to small changes in volatility.