A unit of plane angle, also called a grad or grade. Symbol, gon. One gon is (pi/200) radian; 400 gon = 360°. The symbol is a superscript “g,” for example, 35g. One gon is approximately 0.0157 079 6 radian.

According to the current national standard in the United States¹, the gon is not to be used. The radian should be used instead.

1. IEEE/ASTM SI 10™-2002.
American National Standard for Use of the International System of Units (SI): The Modern Metric System.
New York: IEEE, 30 December 2002.

See Section 3.3.3.


In Vietnam, 195 meters (about 213 yards).


In Persia, a unit of mass, 0.045 gram, later 0.048 gram.

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