Coat of arms of Swift

The blazon

per pale, or and vert, on a chev. betw. three bucks, courant, as many pheons, all counterchanged, on a chief az. three escallops of the first. — Crest, a cubit arm, habited, ar. charged with two bendlets az. grasping a laurel-wreath vert, encircling a martlet 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.