yòu
right
Pictograph of a right hand. The 口 (mouth) component was added later to distinguish the character from 又.
Components
口 Distinguishing component
kǒu
mouth
Evolution

Oracle script
(~1250-1000 BC)
Bronze script
Early Western Zhou (~1000 BC)
Seal script
Shuowen (~100 AD)
Clerical script
Eastern Han dynasty (25-220 AD)Regular script
ModernDefinitions
Sources