帥 means “commander-in-chief, marshal”

すい · sui

Also: commander, leading troops, governor

On'yomi (Chinese reading)
スイ

JLPT N1 · Taught in secondary school · 9 strokes

The story

The army (the left half of 師) beside a cloth banner (巾): picture the commander's standard raised over the troops. 師, teacher, adds a bar across the top of the 巾. 元帥 is a field marshal, and the head of a business empire is called its 総帥.

Used in 元帥 (gensui, field marshal), 総帥 (sousui, supreme leader/head of a group), and 統帥 (tousui, supreme command)

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