孔 means “hole, pore”

こう · kou

Also: cavity, slit, very

Kun'yomi (Japanese reading)
あな
On'yomi (Chinese reading)
コウ, ク

JLPT N1 · Taught in secondary school · 4 strokes

The story

A child (子) beside one long hooked stroke (乚): picture a child peering through a hole bored in a fence. 孔 is a hole or a pore: 鼻孔 is a nostril, 気孔 the pores of a leaf, and 孔子 is Confucius.

Used in 孔子 (koushi, Confucius), 鼻孔 (bikou, nostril), and 気孔 (kikou, stoma/pore)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.