āo​tū

concave-convex

āo concave

Pictograph of a concavity. Opposite of .

Historical Pronunciations

Old Chinese
Zhengzhangqriːw
qriːb

Sources

Readings & variants
Unicode
Historical pronunciations
Zhengzhang Shangfang

protrude

Pictograph of a bump sticking out. Opposite of .

Historical Pronunciations

Old Chinese
Zhengzhangdɯːd
duːd

Sources

Character origin
漢語多功能字庫
Readings & variants
Unicode
Historical pronunciations
Zhengzhang Shangfang