shí, dàn
stone
Pictograph of a musical stone chime. The 口 component was added later as a meaningless decorative mark.
Evolution

Oracle script
(~1250-1000 BC)
Bronze script
Mid Western Zhou (~900 BC)
Seal script
Shuowen (~100 AD)
Clerical script
Eastern Han dynasty (25-220 AD)Regular script
ModernDefinitions
Component uses
Sources
季旭昇《說文新證》p.727