manica

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Wikipedia:
A manica (Latin: manica [ˈmanɪka], "sleeve"; Greek: χεῖρες, kheires, "sleeves") was a type of iron or copper-alloy laminated arm guard with curved, overlapping metal segments or plates fastened to leather straps worn by ancient and late antique heavy cavalry, infantry, and gladiators. It is most widely associated with use by the Romans, Parthians, and Achaemenid and Sasanian Persians.

A manica is an armored sleeve covered in laminar armor.