If we take the Greek numerical letters from 666, we get the letters Chi, Xi and Stigma, the very interesting thing is that the letters Chi and Stigma are the first letter and the last letter of the name Christos and these two letters were and still are used as short form of the name, it is called "Nomina sacra". The middle letter Xi is not included in the name,
but if one look at this letter you get the impression that it represents a serpent, in the case of the nomina sacra it is now so, that over the two letters is a so-called "line", this line is sometimes drawn in a serpent shape. Could it not be that 666 stands for Christos? Chi and Stigma stand for the name Christos and the middle letter Xi for the serpent/satan?
The Bible says that people will worship the image of the beast, and the number is the number of a man. According to this, the beast is not really a living man but an "idol". And now which image has been worshipped for more than 1000 years? It is Jesus, the image of Jesus is the best known image, the man with the strange hand signs. I think everyone has seen a picture of him at least once. And how many kneel before his image today or have an image of him at home? I would say more than one billion.
At the top right you see the Nomina sacra,
XC, and above the line which looks like a serpent, maybe its the Xi letter, which John has seen.