Coat of arms of Crux

The blazon

ar. on a pale sa. an eagle, displayed, betw. two crosses formee of the first, all within a bordure of the second. — Crest, a demi eagle, with wings expanded, ar. holding in his mouth a cross, formee, fitchee, sa, [G7'anted to John Crux, of he Greenhouse, in Middleton, or Milton, Kent, June 10, 7th King Charles J.]

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.