Plural of armband; bands of fabric worn around the upper arm, often used to identify rank, group membership, or as an identifier like a captain's armband in sports.
From arm (the limb) plus band (a strip or circle). Armbands emerged as practical identification in military contexts and evolved into symbols of authority and group membership across sports, ceremonies, and organizations.
Armbands are a brilliant human invention for identification—they're visible at a glance, can't be easily removed like badges, and instantly communicate rank or allegiance, which is why they're used from military captains to protest movements.
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