structural:expansion, information:classification
Writing systems

Before 1929, Azerbaijani was written only in the Perso-Arabic alphabet, an impure abjad that does not represent all vowels (without diacritical marks). In Iran, the process of standardization of orthography started with the publication of Azerbaijani magazines and newspapers such as Varlıq (وارلیق — Existence) from 1979. Azerbaijani-speaking scholars and literarians showed great interest in involvement in such ventures and in working towards the development of a standard writing system. These effort culminated in language seminars being held in Tehran, chaired by the founder of Varlıq, Javad Heyat, in 2001 where a document outlining the standard orthography and writing conventions were published for the public. This standard of writing is today canonized by a Persian–Azeri Turkish dictionary in Iran titled Loghatnāme-ye Torki-ye Āzarbāyjāni.

In 1929–1938 a Latin alphabet was in use for North Azerbaijani (although it was different from the one used now), from 1938 to 1991 the Cyrillic script was used, and in 1991 the current Latin alphabet was introduced, although the transition to it has been rather slow. For instance, until an Aliyev decree on the matter in 2001, newspapers would routinely write headlines in the Latin script, leaving the stories in Cyrillic. The transition has also resulted in some misrendering of İ as Ì. In Dagestan, Azerbaijani is still written in Cyrillic script.

The Azerbaijani Latin alphabet is based on the Turkish Latin alphabet, which in turn was based on former Azerbaijani Latin alphabet because of their linguistic connections and mutual intelligibility. The letters Әə, Xx, and Qq are available only in Azerbaijani for sounds which do not exist as separate phonemes in Turkish.

Northern Azerbaijani, unlike Turkish, respells foreign names to conform with Latin Azerbaijani spelling, e.g. Bush is spelled Buş and Schröder becomes Şröder. Hyphenation across lines directly corresponds to spoken syllables, except for geminated consonants which are hyphenated as two separate consonants as morphonology considers them two separate consonants back to back but enunciated in the onset of the latter syllable as a single long consonant, as in other Turkic languages.