昰
shìxià HSK1

is

Variant form of 是.

Components

旦
旦 Unknown component
dàn dawn

The purpose of this component is unclear.

止
止 Sound component
zhǐ (foot), stop

Character Evolution

Bronze form
Bronze Mid Western Zhou ~900 BC
Bronze form
Bronze Late Western Zhou ~800 BC
Bronze form
Bronze Late Western Zhou ~800 BC
Bronze form
Bronze Early Spring and Autumn ~700 BC
Bronze form
Bronze Mid Spring and Autumn ~600 BC
Bronze form
Bronze Late Spring and Autumn ~500 BC
Bronze form
Bronze Qin 221-206 BC
Seal form
Seal Warring States (Chu) 475-221 BC
Seal form
Seal Warring States (Chu) 475-221 BC
Seal form
Seal Warring States (Chu) 475-221 BC
Seal form
Seal Warring States (Chu) 475-221 BC
Seal form
Seal Shuowen ~100 AD
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
Clerical form
Clerical Eastern Han 25-220 AD
Regular Modern

說文解字

《說文》：“是，直也。从日、正。昰，籀文是，从古文正。”

Sources

Readings & variants
Unicode
Historical images
Academia Sinica
Etymology
Shuowen Jiezi (說文解字)