Technical Glossary G

[G]

G is a way to express the magnitude of acceleration. 1 G is equal to the acceleration due to gravity on the earth (9.8 m/s²). Therefore XG represents multiples of the acceleration due to gravity.
For example:
An acceleration of 200 m/s² is therefore equal to 200(m/s²) ÷9.8（m／s²）＝ approximately 20G.
When speaking of shock, G represents the maximum impact acceleration experienced by a body upon impact. Note that G is not an SI unit.