@SethJ 2 - أ, ء looks like a mirrored 2
3 - ع looks like a mirrored 3
5 - ح, خ look like very similar to a 5 (خ is mostly replaced by kh, ch, or x, and since 7 is used for ح, one doesn't use the number 5 that often)
6 - ط looks like a deformed 6
7 - ح looks like a mirrored 7