括 means “bundle, tie up, bracket”

かつ · katsu

Also: fasten, arrest, constrict

Kun'yomi (Japanese reading)
くくる
On'yomi (Chinese reading)
カツ

JLPT N1 · Taught in secondary school · 9 strokes

The story

A hand (扌) beside a tongue (舌): picture someone tying up a whole meeting in one sentence. 括 is gathering into one: 一括 is all at once, as in 一括払い, paying in full, 総括 is a summing up, and 括弧 are brackets.

Used in 一括 (ikkatsu, all at once/lump sum), 括弧 (kakko, brackets/parentheses), and 総括 (soukatsu, summary/review)

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