shén, shí
what
Original meaning:
file of ten soldiers
The character is based on the original meaning "file of ten soldiers". The modern meaning "what" is a phonetic loan.
Evolution

Seal script
Shuowen (~100 AD)
Clerical script
Qin dynasty (221-206 BC)
Clerical script
Western Han dynasty (202 BC-9 AD)
Clerical script
Western Han dynasty (202 BC-9 AD)Regular script
ModernDefinitions
Sources