Chevron: a shape like a V or an upside-down V, used especially on the sleeve of a police or military uniform to show the wearer's rank.
In some armies, small chevrons are worn on the lower left sleeve to indicate length of service, akin to service stripes in the U.S. military.
One V: Private 列兵
Two V: Corporal 下士
Three V: SERGEANT 中士
