Middle Ages

With the spread of Western Christianity during the Middle Ages, the Latin alphabet was gradually adopted by the peoples of Northern Europe who spoke Celtic languages (displacing the Ogham alphabet) or Germanic languages (displacing earlier Runic alphabets) or Baltic languages, as well as by the speakers of several Uralic languages, most notably Hungarian, Finnish and Estonian.

The Latin script also came into use for writing the West Slavic languages and several South Slavic languages, as the people who spoke them adopted Roman Catholicism. The speakers of East Slavic languages generally adopted Cyrillic along with Orthodox Christianity. The Serbian language uses both scripts, with Cyrillic predominating in official communication and Latin elsewhere, as determined by the Law on Official Use of the Language and Alphabet.^[6]

Since the 16th century

As late as 1500, the Latin script was limited primarily to the languages spoken in Western, Northern, and Central Europe. The Orthodox Christian Slavs of Eastern and Southeastern Europe mostly used Cyrillic, and the Greek alphabet was in use by Greek speakers around the eastern Mediterranean. The Arabic script was widespread within Islam, both among Arabs and non-Arab nations like the Iranians, Indonesians, Malays, and Turkic peoples. Most of the rest of Asia used a variety of Brahmic alphabets or the Chinese script.

Through European colonization the Latin script has spread to the Americas, Oceania, parts of Asia, Africa, and the Pacific, in forms based on the Spanish, Portuguese, English, French, German and Dutch alphabets.

It is used for many Austronesian languages, including the languages of the Philippines and the Malaysian and Indonesian languages, replacing earlier Arabic and indigenous Brahmic alphabets. Latin letters served as the basis for the forms of the Cherokee syllabary developed by Sequoyah; however, the sound values are completely different.^{[citation needed]}

Under Portuguese missionary influence, a Latin alphabet was devised for the Vietnamese language, which had previously used Chinese characters. The Latin-based alphabet replaced the Chinese characters in administration in the 19th century with French rule.

Since the 19th century

In the late 19th century, the Romanians returned to the Latin alphabet, dropping the Romanian Cyrillic alphabet. Romanian is one of the Romance languages.

Since 20th century

In 1928, as part of Mustafa Kemal Atatürk's reforms, the new Republic of Turkey adopted a Latin alphabet for the Turkish language, replacing a modified Arabic alphabet. Most of the Turkic-speaking peoples of the former USSR, including Tatars, Bashkirs, Azeri, Kazakh, Kyrgyz and others, had their writing systems replaced by the Latin-based Uniform Turkic alphabet in the 1930s; but, in the 1940s, all were replaced by Cyrillic.

After the collapse of the Soviet Union in 1991, three of the newly independent Turkic-speaking republics, Azerbaijan, Uzbekistan, Turkmenistan, as well as Romanian-speaking Moldova, officially adopted Latin alphabets for their languages. Kyrgyzstan, Iranian-speaking Tajikistan, and the breakaway region of Transnistria kept the Cyrillic alphabet, chiefly due to their close ties with Russia.

In the 1930s and 1940s, the majority of Kurds replaced the Arabic script with two Latin alphabets. Although only the official Kurdish government uses an Arabic alphabet for public documents, the Latin Kurdish alphabet remains widely used throughout the region by the majority of Kurdish-speakers.

In 1957, the People's Republic of China introduced a script reform to the Zhuang language, changing its orthography from Sawndip, a writing system based on Chinese, to a Latin script alphabet that used a mixture of Latin, Cyrillic, and IPA letters to represent both the phonemes and tones of the Zhuang language, without the use of diacritics. In 1982 this was further standardised to use only Latin script letters.

With the collapse of the Derg and subsequent end of decades of Amharic assimilation in 1991, various ethnic groups in Ethiopia dropped the Geʽez script, which was deemed unsuitable for languages outside of the Semitic branch.^[7] In the following years the Kafa,^[8] Oromo,^[9] Sidama,^[10] Somali,^[10] and Wolaitta^[10] languages switched to Latin while there is continued debate on whether to follow suit for the Hadiyya and Kambaata languages.^[11]

21st century

On 15 September 1999 the authorities of Tatarstan, Russia, passed a law to make the Latin script a co-official writing system alongside Cyrillic for the Tatar language by 2011.^[12] A year later, however, the Russian government overruled the law and banned Latinization on its territory.^[13]

In 2015, the government of Kazakhstan announced that a Kazakh Latin alphabet would replace the Kazakh Cyrillic alphabet as the official writing system for the Kazakh language by 2025.^[14] There are also talks about switching from the Cyrillic script to Latin in Ukraine,^[15] Kyrgyzstan,^[16][17] and Mongolia.^[18] Mongolia, however, has since opted to revive the Mongolian script instead of switching to Latin.^[19]

In October 2019, Inuit Tapiriit Kanatami (ITK), the national organization for Inuit in Canada announced that they will introduce a unified writing system for the Inuit languages in the country. The writing system is based on the Latin alphabet and is modeled after the one used in the Greenlandic language.^[20]

On 12 February 2021 the government of Uzbekistan announced it will finalize the transition from Cyrillic to Latin for the Uzbek language by 2023. Plans to switch to Latin originally began in 1993 but subsequently stalled and Cyrillic remained in widespread use.^[21][22]

At present the Crimean Tatar language uses both Cyrillic and Latin. The use of Latin was originally approved by Crimean Tatar representatives after the Soviet Union's collapse^[23] but was never implemented by the regional government. After Russia's annexation of Crimea in 2014 the Latin script was dropped entirely. Nevertheless, Crimean Tatars outside of Crimea continue to use Latin and on 22 October 2021 the government of Ukraine approved a proposal endorsed by the Mejlis of the Crimean Tatar People to switch the Crimean Tatar language to Latin by 2025.^[24]

In July 2020, 2.6 billion people (36% of the world population) use the Latin alphabet.^[25]

Letters

Some examples of new letters to the standard Latin alphabet are the Runic letters wynn ⟨Ƿ ƿ⟩ and thorn ⟨Þ þ⟩, and the letter eth ⟨Ð/ð⟩, which were added to the alphabet of Old English. Another Irish letter, the insular g, developed into yogh ⟨Ȝ ȝ⟩, used in Middle English. Wynn was later replaced with the new letter ⟨w⟩, eth and thorn with ⟨th⟩, and yogh with ⟨gh⟩. Although the four are no longer part of the English or Irish alphabets, eth and thorn are still used in the modern Icelandic alphabet, while eth is also used by the Faroese alphabet.

Some West, Central and Southern African languages use a few additional letters that have sound values similar to those of their equivalents in the IPA. For example, Adangme uses the letters ⟨Ɛ ɛ⟩ and ⟨Ɔ ɔ⟩, and Ga uses ⟨Ɛ ɛ⟩, ⟨Ŋ ŋ⟩ and ⟨Ɔ ɔ⟩. Hausa uses ⟨Ɓ ɓ⟩ and ⟨Ɗ ɗ⟩ for implosives, and ⟨Ƙ ƙ⟩ for an ejective. Africanists have standardized these into the African reference alphabet.

Dotted and dotless I — ⟨İ i⟩ and ⟨I ı⟩ — are two forms of the letter I used by the Turkish, Azerbaijani, and Kazakh alphabets.^[28] The Azerbaijani language also has ⟨Ə ə⟩, which represents the near-open front unrounded vowel.

Multigraphs

A digraph is a pair of letters used to write one sound or a combination of sounds that does not correspond to the written letters in sequence. Examples are ⟨ch⟩, ⟨ng⟩, ⟨rh⟩, ⟨sh⟩, ⟨ph⟩, ⟨th⟩ in English, and ⟨ij⟩, ⟨ee⟩, ⟨ch⟩ and ⟨ei⟩ in Dutch. In Dutch the ⟨ij⟩ is capitalized as ⟨IJ⟩ or the ligature ⟨IJ⟩, but never as ⟨Ij⟩, and it often takes the appearance of a ligature ⟨ij⟩ very similar to the letter ⟨ÿ⟩ in handwriting.

A trigraph is made up of three letters, like the German ⟨sch⟩, the Breton ⟨c'h⟩ or the Milanese ⟨oeu⟩. In the orthographies of some languages, digraphs and trigraphs are regarded as independent letters of the alphabet in their own right. The capitalization of digraphs and trigraphs is language-dependent, as only the first letter may be capitalized, or all component letters simultaneously (even for words written in title case, where letters after the digraph or trigraph are left in lowercase).

Ligatures

A ligature is a fusion of two or more ordinary letters into a new glyph or character. Examples are ⟨Æ æ⟩ (from ⟨AE⟩, called ash), ⟨Œ œ⟩ (from ⟨OE⟩, sometimes called oethel or eðel), the abbreviation ⟨&⟩ (from Latin: et, lit. 'and', called ampersand), and ⟨ẞ ß⟩ (from ⟨ſʒ⟩ or ⟨ſs⟩, the archaic medial form of ⟨s⟩, followed by an ⟨ʒ⟩ or ⟨s⟩, called sharp S or eszett).

Diacritics

A diacritic, in some cases also called an accent, is a small symbol that can appear above or below a letter, or in some other position, such as the umlaut sign used in the German characters ⟨ä⟩, ⟨ö⟩, ⟨ü⟩ or the Romanian characters ă, â, î, ș, ț. Its main function is to change the phonetic value of the letter to which it is added, but it may also modify the pronunciation of a whole syllable or word, indicate the start of a new syllable, or distinguish between homographs such as the Dutch words een (pronounced [ən]) meaning "a" or "an", and één, (pronounced [e:n]) meaning "one". As with the pronunciation of letters, the effect of diacritics is language-dependent.

English is the only major modern European language that requires no diacritics for its native vocabulary^{[note 1]}. Historically, in formal writing, a diaeresis was sometimes used to indicate the start of a new syllable within a sequence of letters that could otherwise be misinterpreted as being a single vowel (e.g., "coöperative", "reëlect"), but modern writing styles either omit such marks or use a hyphen to indicate a syllable break (e.g. "co-operative", "re-elect"). ^{[note 2][29]}

Collation

Some modified letters, such as the symbols ⟨å⟩, ⟨ä⟩, and ⟨ö⟩, may be regarded as new individual letters in themselves, and assigned a specific place in the alphabet for collation purposes, separate from that of the letter on which they are based, as is done in Swedish. In other cases, such as with ⟨ä⟩, ⟨ö⟩, ⟨ü⟩ in German, this is not done; letter-diacritic combinations being identified with their base letter. The same applies to digraphs and trigraphs. Different diacritics may be treated differently in collation within a single language. For example, in Spanish, the character ⟨ñ⟩ is considered a letter, and sorted between ⟨n⟩ and ⟨o⟩ in dictionaries, but the accented vowels ⟨á⟩, ⟨é⟩, ⟨í⟩, ⟨ó⟩, ⟨ú⟩, ⟨ü⟩ are not separated from the unaccented vowels ⟨a⟩, ⟨e⟩, ⟨i⟩, ⟨o⟩, ⟨u⟩.

Capitalization

The languages that use the Latin script today generally use capital letters to begin paragraphs and sentences and proper nouns. The rules for capitalization have changed over time, and different languages have varied in their rules for capitalization. Old English, for example, was rarely written with even proper nouns capitalized; whereas Modern English of the 18th century had frequently all nouns capitalized, in the same way that Modern German is written today, e.g. German: Alle Schwestern der alten Stadt hatten die Vögel gesehen, lit. 'All of the Sisters of the old City had seen the Birds'.