when was the cross first used in christianity
Christian cross [[File:Spas vsederzhitel sinay.jpg|thumb|upright|The Sinai icon of Christ Pantocrator (6th century), showing Christ with a cruciform halo and holding a book adorned with a crux gemmata]] During the first two centuries of Christianity, the cross was rare in Christian iconography, as it depicts a purposely painful and gruesome method of public execution and Christians were reluctant to use it.[1] A symbol similar to the cross, the staurogram, was used to abbreviate the Greek word for cross in very early New Testament manuscripts such as P66, P45 and P75, almost like a nomen sacrum (nomina sacra).[6] The extensive adoption of the cross as Christian iconographic symbol arose from the 4th century.[7]