Online or when texting on old phones that didn't have Arabic keyboards, people use numbers that look slightly similar to the letters in Arabic instead, like:

- 7 is ح

- 7' is خ (or 5)

- 2 is ء

- 4 is ذ

- 3 is ع

- 3' is غ

- 9 is ص

- 9' is ض

- 6 is ط

- 6' is ظ

- 8 is ق