監 means “oversee, watch”

かん · kan

Also: official, govt office, rule

On'yomi (Chinese reading)
カン

JLPT N1 · Taught in secondary school · 15 strokes

The story

A wide eye (臣) and a person bending over a basin (皿): 監 once showed someone gazing at their reflection in water. Looking hard became watching over: a 監督 runs a film set, 監視カメラ watch the street, and 監修 is expert supervision.

Used in 監督 (kantoku, director/manager), 監視 (kanshi, surveillance), and 監修 (kanshuu, editorial supervision)

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