Coat of arms of Otway

The blazon

ar. a chev. sa. over all a pile, counterchanged. — Crest, out of a ducal coronet or, two wings, expanded, sa. [ Granted 1663.] (Another, ar. on a pile az. a chev. counterchanged.)

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.