Coat of arms of Odo

The blazon

az. two bends, cottised, ar. — Crest, a dexter hand holding a sword. O Doherty, [Ireland,] ar. a buck at full speed, .... on a chief vert, three mullets of the first. — Crest, as the last. O Donavan, [Ireland,] ar. a hand, couped above the wrist, fesseways, cuff turned up, .... holding a sword, in pale, entwined with a serpent. — Crest, an eagle, rising.

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.