jī, qí
(3p possessive)
Shorthand form of 其. The current meaning is a phonetic loan.
Evolution

Bronze script
Warring States (475-221 BC)
Seal script
Shuowen (~100 AD)
Clerical script
Western Han dynasty (202 BC-9 AD)Regular script
ModernDefinitions
Component uses
Iconic component in 1 character (1 verified)
Unknown component in 1 character (1 verified)
Sources
季旭昇《說文新證》p.377
