The Cross:

A traditional symbol for Christians, it is viewed as a reminder of Jesus' sacrifice for the greater good of man. The standard cross is the most widely recognized religious symbol on Earth.

The Star of David:

Jewish symbol composed of two overlaid equilateral triangles that form a six-pointed star. An ancient sign not much used by Jews before the Middle Ages, it was popularized by Kabbalists for protection against evil spirits. The Jewish community of Prague adopted it as an official symbol and its use became widespread in the 17th century. Though it has neither biblical nor Talmudic authority, it became a nearly universal emblem of Judaism in the 19th century.

The Ankh:

An ancient Egyptian symbol, the Ankh has many meanings; life and death, strength, and even the rise of the Sun is represented in the circle rising from the cross bar/horizon.

The Peace Symbol:

This is a universal sign representing peace, it gained wide spread popularity in the late 60's with protests against the Vietnam War. It is worn by many who seek peace in every day life.

Infinity:

The infinity knot is a never-ending symbol. It represents life, death and re-birth. The infinity knot has also been used for centuries as a symbol for undying love, as there is no beginning or end to a love that is true.