Coat of arms of Buckingham

The blazon

erm. on a bend wavy, az. betw. two lions, rampant, gu. three bezants. — Crest, on a chapeau, az. turned up erm. a demi swan, the wings expanded ppr. membered or, gorged with a ducal coronet, gu. {Granted December 15, 1708.]

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.