About Arabic letters
Arabic is written right to left with 28 letters whose shape changes depending on position in the word. Unicode stores the base letter; the font draws the joined form automatically.
The Arabic (101) layout on Windows and the Arabic layout on macOS follow the standard Arabic typewriter arrangement, which is not phonetic. Short vowels (harakat) are typed with Shift plus the number keys on Windows.
Arabic-Indic digits (٠١٢٣) are separate characters from Western digits.
Arabic letters: names and codes
Every letter with its name and Unicode code point. None of these have classic Alt codes; in Word type the hex code and press Alt+X, or use the HTML code on web pages. Click a letter to copy it.