The Estonian Alphabet

The Estonian alphabet is a 27-letter Latin alphabet ^[1] used to write the Estonian language. It includes six special characters not in English: Õ, Ä, Ö, Ü, Š, Ž. The most distinctive is Õ — a back unrounded mid vowel unique to Estonian among European languages. The alphabet is maintained by the Eesti Keele Instituut (Institute of the Estonian Language).

The letters C, Q, W, X, and Y are considered võõrtähed (foreign letters) and are not part of the standard 27-letter alphabet — they appear only in foreign proper names and loanwords. Estonian orthography follows a largely phonemic principle: one letter represents one sound, making the spelling system relatively transparent compared to English or French.

The letter Õ represents a back unrounded mid vowel — a sound that has no dedicated letter in any other major European Latin alphabet ^[2]. It is produced with the tongue positioned back and mid in the mouth, similar to the vowel in British English "bird" but without lip rounding. The sound is sometimes transcribed as /ɤ/ in the International Phonetic Alphabet.

Õ was introduced into the Estonian orthography in the mid-19th century, largely through the work of Johann Voldemar Jannsen and other language reformers. It replaced earlier digraphs and inconsistent representations of this distinctive Estonian vowel. Today Õ is internationally recognised as the emblematic Estonian letter — the most visually distinctive marker that a text is written in Estonian.

Estonian has approximately 1.1 million native speakers ^[1], primarily in Estonia but also in diaspora communities in Finland, Sweden, Germany, the United States, Canada, and Australia. Estonian is the sole official language of the Republic of Estonia, a country of approximately 1.36 million people, with ethnic Estonians making up about 70% of the population.

Estonian is also one of the 24 official languages of the European Union. EU membership since 2004 has significantly expanded the institutional support and international visibility of the language. Despite its relatively small speaker community, Estonian has a rich literary tradition and a fully developed vocabulary for all domains of modern life, supported by the Eesti Keele Instituut ^[1].

Estonian belongs to the Finnic branch of the Uralic language family ^[2]. It is most closely related to Finnish, as well as to other Finnic languages including Karelian, Veps, Ingrian, Livonian, and the Võro-Seto dialects of south Estonia. Estonian is also related — more distantly — to Hungarian, the most widely spoken Uralic language.

Despite the Finnic relationship, Estonian and Finnish are not mutually intelligible without study. Estonian underwent significant phonological changes relative to Finnish, including the loss of vowel harmony (which Finnish retains), reduction of many word-final syllables, and the development of a complex three-way quantity system. The University of Tartu ^[2] is Estonia's leading centre for Uralic and Estonian linguistic research.

The ISO 639-1 code for Estonian is et and the ISO 639-3 code is est ^[1]. These codes are used across digital platforms, language databases, and official documentation to uniquely identify the Estonian language. The code "est" is used in language tagging for web content, software localisation, and international language databases.

The two-letter code et appears in internet domain contexts and international standards. Estonia's country-level internet domain is .ee (from "Eesti"), while the language code et appears in HTML lang attributes for Estonian-language web content. The Eesti Keele Instituut ^[1] is the authoritative national body for Estonian language standardisation and serves as Estonia's representative in international language standardisation bodies.

The Emakeele Selts (Mother Tongue Society) ^[3] is the oldest Estonian language organisation, founded in 1920. It promotes Estonian as a literary, scientific, and official language, publishes research on Estonian grammar and vocabulary, and advocates for the correct and expressive use of the Estonian language.

The society has played a central role in Estonian language cultivation throughout its existence — including during the Soviet period when Estonian identity was under pressure. Today the Emakeele Selts organises language competitions, publishes the journal Keel ja Kirjandus (Language and Literature), and maintains an annual tradition of language-related awards that recognise outstanding contributions to the Estonian language and its literature.

Estonian uses a Latin-based script with 27 letters ^[2]. The Estonian Latin alphabet developed in the 17th–19th centuries from earlier German-influenced orthographic traditions. Before the modern Latin script, Estonian was written using German orthographic conventions — the shift to a cleaner phonemic Latin orthography was a major achievement of 19th-century Estonian language reformers.

During the Soviet occupation, there were some proposals to adopt a Cyrillic script for Estonian (as was done with many Soviet minority languages), but Estonian retained its Latin alphabet throughout the Soviet period. This was a significant exception to Soviet language policy and reflected the relatively strong cultural identity of Baltic nations even within the Soviet system.

Estonian is not classified as endangered — it is the official language of an independent state with approximately 1.1 million speakers ^[1] and is fully functional across all domains including government, education, media, and culture. Estonian has its own university system, rich literature, and strong institutional support including the Eesti Keele Instituut and Emakeele Selts.

However, Estonian does face long-term pressures. Estonia's population is relatively small and declining, and there is significant English-language influence from globalisation. The Estonian government and linguistic institutions work actively to maintain and develop the language, including maintaining the Estonian Language Strategy to ensure Estonian remains a fully functional language in all spheres of public life for future generations.

Estonian and Finnish are closely related Finnic languages and share a significant amount of core vocabulary ^[2]. They share Uralic grammatical features including agglutinative morphology and a case system for nouns. However, they are not mutually intelligible without study due to several centuries of divergent development.

Key differences: Estonian lacks vowel harmony (Finnish has it); Estonian has a three-way quantity contrast (Finnish has only two lengths); Estonian has lost many word-final syllables present in Finnish; and Estonian vocabulary has been influenced more heavily by German and Russian while Finnish has had more Swedish influence. Despite these differences, Finnish speakers can often recognise Estonian as related and may pick up basic Estonian more easily than unrelated languages.