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".
I have the same problem too, so thank you for the link! However in my opinion the text that may help us understand "3" the most is "ع = 3", because it explains how to pronounce it. Still, the whole site seems very helpful!
from tips and notes for topic 10.) Phrases:
3 = ع Today, you’ll hear a sound that we don’t have in English: ع ! Pronouncing ع can be a bit tricky at first. Some people compare its sound to the sound you make when you yawn, some say it’s the sound you make when you hurt yourself and it hurts real bad — some even say it sounds like a duck. You can try this: get close to a mirror, open your mouth wide and fog up the mirror with your breath. You should feel how tight your throat gets when you do this. Now, while doing this, say the vowel a as in cat. That’s about the right sound. Because this letter, when it’s not connected to another letter, looks like a reversed 3, we’ll write it as a 3 in English letters. For example, we write the word عَرَبِيّ as 3arabiyy.