Coat of arms of Hardy

The blazon

sa. on a chev. erm. betw. three escallops ar. as many griffins heads, erased, of the field. — Crest, an arm, embowed, in armour, gauntlet ppr. garnished or, holding a griffin s head, as in the arms. [Borne ly Sir Charles Hardy, R.N. 1790.]

A blazon is the description of a coat of arms in the technical language of heraldry. The drawing comes from that text, and from nothing else.