Coat of arms of Tonson

The blazon

gu. on a fesse ar. two ogresses, in chief, a dexter gauntlet, betw. two castles of the second. — Crest, out of a mural coronet or, a cubit arm, in armour, holding in the hand ppr. a sword 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.