Persian Grammar
Learn About Persian Language

The glottal stop is the sound made when the vocal cords are pressed together to stop the flow of air and then released. For example, the break separating the syllables of the interjection uh-oh. It is present in nearly all dialects of English as a phonetic variant of /t/ (e.g. button). The glottal stop is found in many languages. However, there is no character for it in Latin alphabet because in most Indo-European languages, the glottal stop only occurs at the beginning of a syllable. But in Persian, glottal stops can occur anywhere in a word. Therefore, the glottal stop must be indicated with a letter.

The glottal stop is usually denoted with an apostrophe in educational books and with its IPA sign (ʔ) in academic books. However, the apostrophe is not a letter but a sign that is typically used to indicate contractions. Some examples from various languages:

Language Examples
English she's (she + is)
can't (can + not)
I've (I have)
French l'arbre (le + arbre)
c'est (ce + est)
Italian l'ora (la + ora)
po' (poco)
German geht's (geht + es)

The glottal stop is a sound and it must be denoted with a letter, just like the other sounds of Persian. My proposition is the letter ø. I use it in all my works and reserve apostrophe for its typical uses:

Persian Latin Contraction
ابری‌ست abri'st abri + ast
زین z'in ze + in

It can also be used, for educational purposes, to indicate that adjacent consonants are separate and do not form a digraph:

Persian Latin
مذهب maz'hab
اسهال es'hâl
برگها barg'hâ