The image on the far left is from the Codex Vaticanus (Greek) Bible, A.D. 350, and illustrates exactly what the characters Chi Xi Stigma, or “666,” look like in the original New Testament text. The center image is Arabic and is commonly seen throughout the Islamic world. It spells out “In the name of Allah,” followed by two crossed swords (note that Arabic reads from right to left). The image on the far right is, again, taken from the Codex Vaticanus but with the symbols that resemble “in the name of Allah” flipped, as the Arabic would read. Note the striking similarities between the center and right side images.
http://tulisanmurtad.blogspot.com/2011/04/mark-of-beast.html