曰 — the “say” radical

Radical #73 4 strokes

to speak (flat 曰) 6 of the JLPT kanji on this site are built with it — recognizing the piece makes them far easier to remember.

Kanji using the 曰 radical (6)

最utmost, most 書write 曲bend, music 更grow late, night watch 替exchange, spare 曹office, official

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Radicals (部首, bushu) are the shared building blocks of kanji, used to sort them in every dictionary. Learn the common ones and new kanji stop looking random.