Coat of arms of Portal

The blazon

ar. a castle gu. on a chief az. a crescent, betw. two mullets of the field. — Crest, a castle ar. [Borne by William Portal, of Ash- Park, Overton, Hampshire, Esq. 1826.]

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.