dīng, dìng
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Simplified form of 釘. Phonosemantic compound. 金 represents the meaning and 丁 represents the sound.
Evolution

Seal script
Shuowen (~100 AD)
Clerical script
Western Han dynasty (202 BC-9 AD)
Seal script
Western Han dynasty (202 BC-9 AD)Traditional script
ModernSimplified script
ModernDefinitions