What is the symbolic meaning of the tau cross?

Answer 1

The Cross of Tau; also called the Tau Cross, St. Anthony's Cross, the Old Testament Cross, the Anticipatory Cross, the Cross Commissee, the Egyptian Cross, the Advent Cross, "Saint Francis's Cross" or the Crux Commissa. Hence, this cross is often used during the Advent season.

As with Christianity, other ancient societies who used the "Tau" symbol also expanded upon its symbolism to include life, resurrection, reincarnation, and blood sacrifice.[citation needed] These crosses are rare, and only a few are left in the world, the most well known being the cross on Tory Island in County Donegal, Ireland. http://en.wikipedia.org/wiki/Cross_of_Tau

Answer 2

Wikipedia has an excellent article on the Tau cross, check out the link below