Coat of arms of Sydney

The blazon

or, a pheon az. — Crest, a porcupine az. quills or, collared and chained of the last, the chain reflexed over the back. [Borne by Sydney, Esq. of Riclwiond, Surrey, 1823.]

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.