This is a seal from the book "Lesser Key of Solomon". According this text, the spirit Aim, is described thus
"The Twenty-third Spirit is Aim. He is
a Great Strong Duke. He appeareth in the form of a
very handsome Man in body, but with three Heads; the
first, like a Serpent, the second like a Man haying two
Stars on his Forehead, the third like a Calf. He rideth
on a Viper, carrying a Firebrand in his Hand, wherewith
he setteth cities, castles, and great Places, on fire.
He maketh thee witty in all manner of ways, and giveth
true answers unto private matters. He governeth 26
Legions of Inferior Spirits; and his Seal is this, which
wear thou as aforesaid, etc"