Coat of arms of Elwill

The blazon

erm. on a chev. engr. betw. three eagles, displayed, with two heads gu. each gorged with a ducal coronet or, as many annulets of the last. — Crest, an arm, erect, and couped at the elbow, habited sa. cuff ar. the hqnd ppr. holding a fleece or. [Created a Bart. August 25, 1709. Granted December 11, 1701.]

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.