` = "Standard gravity acceleration"`

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Standard gravity is the acceleration of a body if it were in a vacuum or near the surface of the Earth.

Sometimes it is referred to as Standard Gravity,Standard Earth gravity or Standard Acceleration due to free fall denoted by g₀ or g_n 

The standard gravity (g₀) value, rounded to 9.807 m/s^2, represents a value based on an object in free fall at sea level at 45 degrees latitude. The standard gravity constant is commonly used for meteorological purposes, but the actual value varies based on the specific location of an object.

Acceleration of Gravity in SI Units
    g = 9.81 m/s²
 Acceleration of Gravity in Imperial Units
    g = 32.174 ft/s² = 35 kph/s = 22 mph/s