the.com/blazon

means A formal, technical description of a coat of arms (or, by extension, any vivid public proclamation) using a strict set of heraldic terms and conventions.

from From Old French 'blason,' meaning a shield — the object itself lent its name to the art of describing it. By the time the word crossed into English in the medieval period, it covered both the shield's painted design and the specialized vocabulary (gules, or, fess, chevron) used to encode that design in words, since heraldic artists needed a precise shorthand to reproduce arms correctly without seeing the original. The verb 'to blazon' — to proclaim or display boldly — grew from this same root, since a coat of arms was itself a loud, public declaration of identity. The deeper root before French is uncertain; despite a tempting resemblance, a connection to 'blaze' (fire) or to Germanic words for 'horn' (as in trumpeting an announcement) remains disputed rather than settled.