yīn, yān, yǐn
late Shang dynasty, many
Original meaning:
intense pain from an illness
Depicts a person with a swollen abdomen (㐆) receiving an acupuncture from a hand holding a needle (殳). Based on the original meaning "intense pain from an illness". The meaning later shifted to "abundant" and "many" while it's other meaning used as the name of a dynasty at the end of the Shang dynasty is a phonetic loan.
Components
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