藍 means “indigo”

あい · ai

Kun'yomi (Japanese reading)
あい
On'yomi (Chinese reading)
ラン

JLPT N1 · Taught in secondary school · 18 strokes

The story

A plant (艹) over 監, to watch over: picture dyers tending vats as the leaves ferment into blue. 藍 is indigo, the plant and its color; Tokushima has grown it for centuries for 藍染め, and Tokyo 2020's emblem was a ring of indigo checks.

Used in 藍色 (aiiro, indigo blue), 藍染め (aizome, indigo dyeing), and 出藍の誉れ (shutsuran no homare, a pupil who surpasses the teacher)

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