平 means “flat, even, peace”

へい · hei

Kun'yomi (Japanese reading)
たいら, たいらげる, ひら
On'yomi (Chinese reading)
ヘイ, ビョウ, ヒョウ

JLPT N3 · Taught in grade 3 · 5 strokes

The story

Picture a set of scales, its beam lying perfectly level. 平 is flat, calm and ordinary: 平和 is peace, 平日 are weekdays, and 平仮名 is hiragana, the "plain" kana.

Used in 平和 (heiwa, peace), 平日 (heijitsu, weekday), and 平気 (heiki, unbothered)

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