“Above us, at the International Convention at St. Louis in 1955, floated a banner on which was inscribed the then new symbol for A.A., a circle enclosing a triangle. The circle stands for the whole world of A.A., and the triangle stands for A.A.’s Three Legacies: Recovery, Unity, and Service.
“It is perhaps no accident that priests and seers of antiquity regarded this symbol as a means of warding off spirits of evil.
-Comes of Age, Pg. 139
Here is a talk from Bill W. at the first international convention in Cleveland Ohio.