tí
topic
Original meaning:
forehead
Simplified form of 題. Phonosemantic compound. 页 represents the meaning and 是 represents the sound. The character is based on the original meaning "forehead". The current meaning is a phonetic loan.
Evolution

Seal script
Shuowen (~100 AD)
Clerical script
Eastern Han dynasty (25-220 AD)Traditional script
ModernSimplified script
ModernDefinitions
Sources