noun
sleeve badge; identification flag on shoulder armour
Historical term for a small cloth marker worn on the shoulder of armour to distinguish allies from enemies in battle.
戦国時代の武士は、味方と敵を見分けるために袖標を鎧の肩に付けた。
Warriors in the Sengoku period attached sleeve badges to the shoulders of their armour to tell friend from foe.
Compound of 袖 (sode, 'sleeve') and 標 (shirushi, 'mark, sign'), referring to a marker worn on the sleeve or shoulder area of armour.