the.com/scale mail

means A type of ancient and medieval armor made from small overlapping metal or horn plates attached to a backing of cloth or leather, like a fish or reptile's skin turned into a breastplate.

from The armor itself is ancient — scaled defenses appear in artwork and graves from the Near East and classical antiquity, long before the word for it settled into English. 'Scale' traces back through Old French 'escale' to a Germanic root meaning a thin flake or husk, the same root that gives us the scales on fish and the flaking scale of skin. 'Mail,' confusingly, has nothing to do with post offices or metal — it comes from Old French 'maille,' from Latin 'macula,' meaning a mesh or a spot/mesh-hole in a net. So 'scale mail' is literally 'flake-mesh': small flake-like plates doing the job a woven mesh does in chainmail.