àn​chèng

counter scale

àn table, case, incident

Phonosemantic compound. represents the meaning and represents the sound.

Components

Sound component
ān peaceful
Meaning component
tree

Character Evolution

Seal form
Seal Shuowen ~100 AD
Clerical form
Clerical Qin 221-206 BC
Clerical form
Clerical Eastern Han 25-220 AD
Clerical form
Clerical Eastern Han 25-220 AD
Regular Modern

Historical Pronunciations

Middle ChineseOld ChineseGloss
Baxter-Sagart'anHʔˤa[n]-s stool; tray

說文解字

《說文》:“案,几屬。从木,安聲。”

Sources

Character origin
漢語多功能字庫
Readings & variants
Unicode
Historical pronunciations
Baxter-Sagart
Historical images
Academia Sinica

chèng balance

A balance  used to measure grain 

Components

Meaning component
grain stalk
Meaning component
píng flat

Historical Pronunciations

Old Chinese
Zhengzhangtʰjɯŋs

Sources

Readings & variants
Unicode
Historical pronunciations
Zhengzhang Shangfang