There is a different view on the mark that is rather convincing:-
The real meaning of 666. “In the name of Allah. Islam”
The apostle John wrote the book of Revelation because God gave him visions of the future. At one point he was shown some type of mark that people had on their right arm or forehead and this mark identified the people who belonged to the beast or antichrist.
Revelation 13:16-18 says.
“It also forced all people, great and small, rich and poor, free and slave, to receive a mark on their right hands or their foreheads, so that they could not buy or sell unless they had the mark, which is the name of the beast or the number of its name. This calls for wisdom. Let the person who has insight calculate the number of the beast, for it is the number of a man. That number is six hundred, three score and six.”
Now the book of “Revelation” is called “Revelation” because the hidden things within it will be revealed at the appointed time that God wants them revealed. People have studied the number “666” for many years and tried to decipher it but nobody has come up with a real answer to it until a few years ago.
A man by the name of Walid Shoebat, who was a Muslim, wanted to prove the bible wrong and so he studied it. He even studied reading one of the oldest copies of the New Testament that we have. This copy of the New Testament was written in Greek, so people have always interpreted it from Greek to English. As he was reading through the book of Revelation in this old text, he came to the part that speaks of the beast and the number “six hundred, three score and six”. As soon as he saw this, he did not read the “666” in Greek but he saw something else in Arabic, as he is of this origin. It said, “In the name of Allah. Islam”
God had hidden the actual meaning of the numbers until now because scholars were reading it in Greek and not Arabic.
The "X,E,5" in this following picture are the texts that Walid Shoebat saw.
The first symbol, which is the “X” shaped symbol, is very similar to the Arabic symbol of Islam, which is, “The crossed swords”. The crossed swords or the “X” mean “Islam”. You will even see the crossed swords on some of the Muslim nation’s flags.
The last letter that looks like a “5”, if read in Arabic is “Bismillah,” or “in the name of”. You may have heard this chant said by terrorists before they do their evil act.
Now, if the middle letter that looks like an “E” is rotated anticlockwise a little, it reads in Arabic the word “Allah”.
The middle letter can be read and understood even if it is not turned but most of the time the word “Allah” is written in the “W” shape and not the “E” shape.
Arabic writing is read from right to left. So, when read in Arabic from right to left, the symbols, “666” actually say “In the name of Allah. Islam”
On TV we often see Muslims wearing this number on their foreheads to proclaim their faith in Allah. Some Isis fighters also had it on their arm.
In Revelation 13:16-17 it says, "He causes all, both small and great, rich and poor, free and slave, to receive a mark on their right hand or on their foreheads, and that no one may buy or sell except one who has the mark or the name of the beast, or the number of his name."
This already happens in Islam. When Isis took over an area, if a person who owned a business wanted to keep trading, they had to pay a tax called "Jizya." When the time comes though, all that is needed for the prophecy to be fulfilled is for the anti-Christ to make a mandatory order for everyone who believes in Islam to wear the head banner to prove that they are true Muslims. Anyone who refuses to take the number/headscarf will be considered not to be a true believer in Allah and will not be able to trade.
Here is a great YouTube clip: Only 6 minutes:
The person speaking is Walid Schoebat. He was the Muslim terrorist (now Christian) who first read the “666” in Arabic. It is well worth watching.