Coat of arms of Doherty

The blazon

ar. a stag, couchant, ppr. on a chief vert, a mullet of the field. — Crest, a dexter arm, couped below the wrist ppr. grasping a dagger of the last, hilt and pomel or.

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.