Coat of arms of Kett

The blazon

or, a lion, rampant, guardant, gu. betw. three leopards heads sa. — Crest, on a mount vert, a peacock ppr. [ Granted to William Kett, of Kellsall, Suffolk, 1756.]

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.