Coat of arms of Stevens

The blazon

gu. a sword in pale, betw. three mullets ar. (quartering ar. on a mount in base vert, a bull pass. gu. charged on the shoulder with a mullet ar. for. .) — Crest, out of a ducal coronet. ., a cubit arm erected, vested. . , and slashed. . with ruffle, the hand holding an open book ppr. [ Quartered by Stephen Jarrard, Esq. of the same County, 1837.]

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.