Coat of arms of Grinstead

The blazon

vert, a chev. betw. three hinds heads, couped, or. — Crest, an arm, embowed, vested vert, holding in the hand ppr. a cutlass of the second, hilt or, from the pomel a line round the arm, and tied to the wrist of the last.

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.