The Christian Cross, seen as a representation of the instrument of the crucifixion of Jesus, is the best-known symbol of Christianity. The other symbol for Christianity is an ichthys. It is related to the crucifix (a cross that includes a usually three-dimensional representation of Jesus' body) and to the more general family of cross symbols.

In contemporary Christianity, the cross is a symbol of the atonement and reminds Christians of God's love in sacrificing his own son for humanity. It represents Jesus' victory over sin and death, since it is believed that through his death and resurrection he conquered death itself. See Colossians 2:15, "Having disarmed the powers and authorities, he made a public spectacle of them, triumphing over them by the cross".

Roman Catholics, Eastern Orthodox, Oriental Orthodox, members of the major branches of Lutheranism, some Anglicans, and other Christians often make the Sign of the Cross upon themselves. This was already a common Christian practice in the time of Tertullian.

The Feast of the Cross is an important Christian feast. One of the twelve Great Feasts in Eastern Orthodoxy is the Exaltation of the Cross on September 14, which commemorates the consecration of the basilica on the site where the original cross of Jesus was reportedly discovered in 326 by Helena of Constantinople, mother of Constantine the Great. The Catholic Church celebrates the feast on the same day and under the same name (In Exaltatione Sanctae Crucis), though in English it has been called the feast of the Triumph of the Cross.

Source: Christian cross from Wikipedia

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