制 means “control, system”

せい · sei

Also: law, rule

On'yomi (Chinese reading)
セイ

JLPT N3 · Taught in grade 5 · 8 strokes

The story

A knife (刂) pruning a tree's overgrown branches: cutting things into shape. 制 is control and system: 制限 is a limit, 制度 an institution, and 制服, "regulated clothes", is the uniform most Japanese high schoolers wear.

Used in 制服 (seifuku, uniform), 制度 (seido, system/institution), and 制限 (seigen, limit/restriction)

More from Law & Order

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