繁 means “thriving, thick, busy”

はん · han

Also: luxuriant, overgrown, frequency

Kun'yomi (Japanese reading)
しげる, しげく
On'yomi (Chinese reading)
ハン

JLPT N1 · Taught in secondary school · 16 strokes

The story

Nimble (敏) over thread (糸): fingers flying across a loom, threads crowding thick. 繁 is thick and busy: 繁華街 is a bustling downtown, 頻繁 is frequent, and 繁栄 is prosperity.

Used in 繁栄 (han'ei, prosperity), 頻繁 (hinpan, frequent), and 繁華街 (hankagai, busy downtown district)

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