Ok...I believe that is an olive wreath. There are many things that use this symbol. I found this...

"Olive wreath

The Olive wreath also known as kotinos (Greek: κότινος), was the prize for the winner at the ancient Olympic Games. It was a branch of the wild olive tree Kallistefanos Elea (also referred to as Elaia Kallistephanos) that grew at Olympia, intertwined to form a circle or a horse-shoe. The branches of the sacred wild-olive tree near the temple of Zeus were cut by a “pais amfithalis” (a boy whose parents were both alive) with a pair of golden scissors. Then he took them to the temple of Hera and placed them on a gold-ivory table. From there, the Hellanodikai (the judges of the Olympic Games) would take them, make the wreaths and crown the winners of the Games."