Ankh

The Ankh, symbol of life or eternal life was associated with water, the sustainer of all life. One theory suggests it originated from the loop of a sandal strap, another that the loop represents the sunrise over the horizon (crossbar). Many believe the loop to be the female sexual organ while the vertical part of the cross is the male organ, but this is not accepted by scholars. Egyptian gods are typically shown carrying ankhs.

The Ancient Ankh, Symbol of Life
The Ankh was, for the ancient Egyptians, the symbol (the actual Hieroglyphic sign) of life but it is an enduring icon that remains with us even today as a Christian cross.
touregypt.net/featurestories/ankh.htm

Ankh: The Original Cross
The Ankh is defined as: The symbolic representation of both Physical and Eternal life. It is known as the original cross, which is a powerful symbol that was first created by Africans in Ancient Egypt.
www.swagga.com/ankh.htm

The Symbolism of the Egyptian Ankh
The symbol for HEART in the Language of Light is the counterpart of the ankh symbol... The ankh symbol... proclaims that DUALITY (the masculine /feminine or positive/negative force) has been overcome by NEUTRALITY.
www.language-of-light.com/sacred_spiritual_mysteries/egyptian_ankh.htm