Option Vega is the change in the value of an option for a 1-percentage point increase in implied volatility, i.e. the first derivative of the option price with respect to volatility.
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Vega represents the amount of light from a star.
Vega
1992
An arc second is a measure of angular separation, not of distance. It is therefore an inappropriate unit for measuring the distance to a star.
The rate of change for delta with respect to the underlying asset's price. Mathematically, gamma is the first derivative of delta and is used when trying to gauge the price of an option relative to the amount it is in or out of the money. When the option being measured is deep in or out of the money, gamma is small. When the option is near the money, gamma is largest.