zhì
nature, substance
Original meaning:
pledge, pawn
Simplified form of 質. Phonosemantic compound. 斦 represents the sound and 贝 represents the meaning.
Components
Evolution

Bronze script
Late Western Zhou (~800 BC)
Seal script
Shuowen (~100 AD)
Clerical script
Eastern Han dynasty (25-220 AD)Traditional script
ModernSimplified script
ModernDefinitions
Sources
季旭昇《說文新證》p. 522