The Cinquefoil (from the French, five-part) is a five petaled rose found in Christian symbolism of the Middle Ages. The five-petaled rose is often found affixed to the tops of Gothic arches, the vesica pisces-shaped doorways and windows thought to represent the womb of Mary. Some historians have speculated that the rose in Gothic architecture is a secret symbol of the feminine principle, one of a multitude of hermetic symbols found in these churches.
The symbol itself dates back to Roman times, where it was called the "Rose of Venus." The rose, with its characteristic five petaled shape mimicked the pentagrammatic path traced by the planet Venus in the night sky. This, combined with the flower's natural beauty, made it an obvious symbol of the Goddess of love. Aleister Crowley combined the rose emblem with the Unicursal hexagram to symbolize the divine union, and the magical number eleven. It's interesting to note that the galactic alignment is scheduled for exactly 11:11 on Dec. 21st 2012.. and of course the eleven in 9/11. Tracing between the petals reveals a perfect pentagram.