To my knowledge, no. At the time that Hellonistic religions were widely practiced other gods of other cultures were generally adopted into a pantheon, or otherwise acknowledged as deities in their own right. The Greeks, and Romans subsequently, frequently simply superimposed their particular god or goddess over another culture's, even as other cultures did the same to them. There wasn't really much of a symbol for the pantheon as a whole, and the lines were quite blurred.
Then again, I may be wrong. Somebody might turn up with one.