Coat of arms of Guillam

The blazon

ar. on a chev. sa. betw. three dolphins, naiant, embowed, ppr. as many towers of the field. — Crest, a dolphin, haurieut, em bowed, ppr. Gorges, a whirlpool

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.