ChristianityBasic Latin cross, 2nd century CE
The Christian cross was in use from the time of early Christianity, but it remained less prominent than competing symbols (Ichthys, Staurogram, Alpha and Omega, Christogram, Labarum, etc.) until the medieval Crusades. Early Christianity had use for such symbols due to the persecution of Christians in the Roman Empire, as the symbol allowed inconspicuous identification of one Christian to another. (wikipedia)
[The] cross [is] the principal symbol of the Christian religion, recalling the Crucifixion of Jesus Christ and the redeeming benefits of his Passion and death. The cross is thus a sign both of Christ himself and of the faith of Christians. In ceremonial usage, making a sign of the cross may be, according to the context, an act of profession of faith, a prayer, a dedication, or a benediction. (
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