wèi
guard
Simplified from 衛. Phonosemantic compound. 行 represents the meaning and 韋 represents the sound. The 行 component was deleted for simplification.
Components
Evolution

Bronze script
Late Shang dynasty (~1100 BC)
Oracle script
(~1250-1000 BC)
Seal script
Shuowen (~100 AD)
Clerical script
Eastern Han dynasty (25-220 AD)Traditional script
ModernSimplified script
ModernDefinitions
Sources