Coat of arms of Murray

The blazon

az. a saltier in fesse, betw. three mullets, two and one, ar. — Crest, a demi man, couped at the thighs ppr. wreathed about the temples and middle vert, holding in the dexter hand a sword, and in the sinister, a key, all ppr.

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.