Hamza

The hamza (Arabic: هَمْزَة hamza) (‏ء‎) is an Arabic script character that, in the Arabic alphabet, denotes a glottal stop and, in non-Arabic languages, indicates a diphthong, vowel, or other features, depending on the language. Derived from the letter ʿayn (‏ع‎), the hamza is written in initial, medial, and final positions as an unlinked letter or placed above or under a carrier character. Despite its common usage as a letter in Modern Standard Arabic, it is generally not considered to be one of its letters, although some argue that it should be considered so.

The hamza is often romanized as a typewriter apostrophe ('), a modifier letter apostrophe (ʼ), a modifier letter right half ring (ʾ), or as the International Phonetic Alphabet symbol ⟨ʔ⟩. In Arabizi, it is either written as "2" or not written at all.