Coat of arms of Litchfield

The blazon

erm. on a chief, indented, az. three martlets or, each holding in his beak a trefoil, slipped, ar. — Crest, out of a mural crown, per pale, or and az. a snake, erect, ppr. holding in his mouth a trefoil, slipped, vert. [Granted 1722.]

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.