[Rurudyne]

As stated: the script looks like Greek letters which are associated with numbers.

Also, Islamic Arabic script as we are talking of here is not the same as Syriac. Many consider it to be derived from Nabatean instead. Even then the script does not look like either Syriac or Nanpbatean but has many stylistic differences no matter which it came from.

In short, it is a script that John would not have known.

[Rurudyne]

I have no idea how autocorrect jumped in to give me “Nanpbatean”. None at all....

[Olog-hai]

It was explicitly inspired in the Greek text to refer to the number of the Beast as a number and not anything else (the Greek word arithmos in Revelation 13:17-18 does mean “number”). I can only warn you away from implying God to be deceptive or even obscure about such an important element of His Revelation; and no, John was not mistaking anything from any abjad to be something else in the Greek or else he would have said it was such a thing instead (John was no fool).

And again, this entity called the Beast was around during the time of Jesus and the Apostles; it was the cause of John being on Patmos in the first place.