Coat of arms of Mackinlay

The blazon

gu. a stag, trippant, ar. — Crest, an armed arm holding a branch of olive, all ppr. M£Kinna, [West Indies, originally of Ireland,] sa. three pairs of keys, each pair having their handles downward, lozenged, interlaced, and endorsed, or, two and one. — Crest, a dexter arm, embowed, in armour, holding the butt end of a spear, ppr.

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.