c. 1300, "shield," diminutive of late Old English targe, from Old French targe "light shield" (12c.), from Frankish *targa "shield," from Proto-Germanic *targ- (source also of Old High German zarga "edging, border," German zarge "border, edge, frame," Old English targe, Old Norse targa "shield, buckler"), perhaps originally "edge of a shield." Meaning "round object to be aimed at in shooting" first recorded 1757, originally in archery, perhaps suggested by the concentric circles in both. Target-practice is from 1801. Target audience is by 1951; early reference is to Cold War psychological warfare.
"shield on which a coat of arms is depicted," late 15c., from Old North French escuchon, variant of Old French escusson "half-crown (coin); coat of arms, heraldic escutcheon," from Vulgar Latin *scutionem, from Latin scutum "shield," from PIE *skoito- "piece of wood, sheath, shield" (source also of Old Irish sciath, Welsh ysgwyd, Breton scoed "shield;" Old Prussian staytan "shield;" Russian ščit "shield"), probably a noun derivative of a variant of PIE root *skei- "to cut, split," on the notion of "board."
Escutcheon of pretense, in her., a small escutcheon charged upon the main escutcheon, indicating the wearer's pretensions to some distinction, or to an estate, armorial bearings, etc., which are not his by strict right of descent. It is especially used to denote the marriage of the bearer to an heiress whose arms it bears. Also called inescutcheon. [Century Dictionary]
Clev. Without doubt: he is a Knight?
Jord. Yes Sir.
Clev. He is a Fool too?
Jord. A little shallow[,] my Brother writes me word, but that is a blot in many a Knights Escutcheon.
[Edward Ravenscroft, "Mamamouchi, or the Citizen Turn'd Gentleman," 1675]