What does "3" mean?
What does "3" mean in Arabic? Sometime is soundes like "R" And somethimes "y"?
These is part of several numbers used to write Arabic in Latin letters. This method is bad and not standard, my recommendation is not to bother with it for now. The letter is this one: https://en.wikipedia.org/wiki/Ayin#Arabic_%CA%BFayn
There is a short explanation here: https://duome.eu/tips/en/ar ("What's the Deal With the 2"). The idea is to use numbers for those Arabic characters that have no corresponding letter in the latin alphabet. This concept is also used for other letters.
Edit (after the question refering to "2" has been edited): The same holds for "3".