凹凸形 Origin — Dong Chinese Dictionary

āotūxíng

crenelated

āo concave

Pictograph of a concavity. Opposite of 凸.

	Old Chinese
Zhengzhang	qriːw
	qriːb

Pictograph of a bump sticking out. Opposite of 凹.

	Old Chinese
Zhengzhang	dɯːd
	duːd

Phonosemantic compound. 彡 represents the meaning and 井 represents the sound.

井 Sound component

jǐng well

Change in form

Due to historical stylistic changes, this component is less similar to 井 than it was in ancient scripts.

彡 Meaning component

shān, xiǎn hair

Three lines depicting a shape

Regular Modern

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	Middle Chinese	Old Chinese	Gloss
Baxter-Sagart	heng	[ɢ]ˤeŋ	form, shape

《說文》：“形，象形也。从彡，幵聲。”