Emblazon

In heraldry and heraldic vexillology, a blazon is a formal description of a coat of arms, flag or similar emblem, from which the reader can reconstruct the appropriate image. The verb to blazon means to create such a description. The visual depiction of a coat of arms or flag has traditionally had considerable latitude in design, but a verbal blazon specifies the essentially distinctive elements. A coat of arms or flag is therefore primarily defined not by a picture but rather by the wording of its blazon (though often flags are in modern usage additionally and more precisely defined using geometrical specifications). Blazon also refers to the specialized language in which a blazon is written, and, as a verb, to the act of writing such a description. This language has its own vocabulary, grammar and syntax, or rules governing word order, which becomes essential for comprehension when blazoning a complex coat of arms.

Other armorial objects and devices – such as badges, banners, and seals – may also be described in blazon.

The noun and verb blazon (referring to a verbal description) are not to be confused with the noun emblazonment, or the verb to emblazon, both of which relate to the graphic representation of a coat of arms or heraldic device.

The word blazon is derived from French blason, "shield". It is found in English by the end of the 14th century.

Formerly, heraldic authorities believed that the word was related to the German verb blasen, "to blow (a horn)". Present-day lexicographers reject this theory as conjectural and disproved.

Blazon is generally designed to eliminate ambiguity of interpretation, to be as concise as possible, and to avoid repetition and extraneous punctuation. English antiquarian Charles Boutell stated in 1864:

Heraldic language is most concise, and it is always minutely exact, definite, and explicit; all unnecessary words are omitted, and all repetitions are carefully avoided; and, at the same time, every detail is specified with absolute precision. The nomenclature is equally significant, and its aim is to combine definitive exactness with a brevity that is indeed laconic.

...
Wikipedia