The umlaut (/ˈʊmlt/) is the diacritical mark (◌̈) used to indicate in writing (as part of the letters ⟨ä⟩, ⟨ö⟩, and ⟨ü⟩) the result of the historical sound shift due to which former back vowels are now pronounced as front vowels (for example [a], [ɔ], and [ʊ] as [ɛ], [œ], and [ʏ]). (The term Germanic umlaut is also used for the underlying historical sound shift process.)

In its contemporary printed form, the mark consists of two dots placed over the letter to represent the changed vowel sound. It looks identical to the diaeresis mark used in other European languages and is represented by the same Unicode code point. The word trema (French: tréma), used in linguistics and also classical scholarship, describes the form of both the umlaut diacritic and the diaeresis rather than their function and is used in those contexts to refer to either.

U-umlauts on a German traffic sign

German origin and current usage

Umlaut (literally "changed sound") is the German name of the sound shift phenomenon also known as i-mutation. In German, this term is also used for the corresponding letters ä, ö, and ü (and the diphthong äu) and the sounds that these letters represent. In German, the combination of a letter with the diacritical mark is called Umlaut, while the marks themselves are called Umlautzeichen (literally "umlaut sign").

In German, the umlaut diacritic indicates that the short back vowels and the diphthong [aʊ] are pronounced ("shifted forward in the mouth") as follows:

And the long back vowels are pronounced in the front of the mouth as follows:

In modern German orthography, the affected graphemes ⟨a⟩, ⟨o⟩, ⟨u⟩, and ⟨au⟩ are written as ä, ö, ü, and ⟨äu⟩, i.e. they are written with the umlaut diacritic, which looks identical to the diaeresis mark used in other European languages and is represented by the same Unicode character.


Further information: Germanic umlaut

New and old forms of umlaut
Illustration of the development of umlaut: schoenschoͤnschön ('beautiful'). The Sütterlin script used here is a later development, however.

The Germanic umlaut is a specific historical phenomenon of vowel-fronting in German and other Germanic languages, including English. English examples are 'man ~ men' and 'foot ~ feet' (from Proto-Germanic *fōts, pl. *fōtiz), but English orthography does not indicate this vowel change using the umlaut diacritic.

German phonological umlaut was present in the Old High German period and continued to develop in Middle High German. From the Middle High German period, it was sometimes denoted in written German by adding an e to the affected vowel, either after the vowel or, in small form, above it. This can still be seen in some names, e.g. Goethe, Goebbels, Staedtler.[b] In medieval German manuscripts, other digraphs were also commonly written using superscripts. In bluome ("flower"), for example, the ⟨o⟩ was frequently placed above the ⟨u⟩ (blůme). This letter survives now only in Czech. Compare also ñ for the digraph nn, with the tilde as a superscript ⟨n⟩.

In blackletter handwriting, as used in German manuscripts of the later Middle Ages, and also in many printed texts of the early modern period, the superscript ⟨e⟩ still had a form that would be recognisable as an ⟨e⟩, but in manuscript writing, umlauted vowels could be indicated by two dots since the late medieval period.

In the forms of handwriting that emerged in the early modern period (of which Sütterlin is the latest and best-known example) the letter ⟨e⟩ was composed of two short vertical lines very close together, and the superscript ⟨e⟩ looked like two tiny strokes. Even from the 16th century, the handwritten convention of indicating umlaut by two dots placed above the affected vowel is also found in printed texts.

Unusual umlaut designs are sometimes also created for graphic design purposes, such as to fit umlaut dots into tightly spaced lines of text.[1] This may include umlaut dots placed vertically or inside the body of the letter.[2][3][4]

Printing conventions in German

When typing German with a keyboard that doesn't have umlaut letters, it is usual to replace them with the underlying vowel followed by an ⟨e⟩. So, for example, "Schröder" becomes "Schroeder". As the pronunciation differs greatly between the normal letter and the umlaut, simply omitting the dots would be incorrect. The result would often be a different word, as in schon "already", schön "beautiful"; or a different grammatic form, e.g. Mutter "mother", Mütter "mothers".

Despite this, the umlauted letters are not considered to be separate letters of the alphabet in German, in contrast to the situation in other Germanic languages.

When alphabetically sorting German words, the umlaut is usually not distinguished from the underlying vowel, although if two words differ only by an umlaut, the umlauted one comes second, for example:

  1. schon
  2. schön
  3. schonen

There is a second system in limited use, mostly for sorting names (such as in telephone directories),[5][6] which treats ö like oe, and so on.

  1. schön
  2. schon
  3. schonen

Austrian telephone directories insert ö after oz.

  1. schon
  2. schonen
  3. schön
Swiss keyboard layout

In Switzerland, capital umlauts are sometimes printed as digraphs, in other words, ⟨Ae⟩, ⟨Oe⟩, ⟨Ue⟩, instead of ⟨Ä⟩, ⟨Ö⟩, ⟨Ü⟩ (see German alphabet § Umlaut diacritic usage for an elaboration). This is because[citation needed] Swiss typewriter keyboards use the same keys for French accents (in Swiss French) as are used for German umlauts (in Swiss German) and which version is active (on a computer) is chosen by system setting. Consequently to apply an accent or umlaut to a capital letter requires use of a dead key mechanism.

Borrowing of German umlaut notation

Some languages have borrowed some of the forms of the German letters Ä, Ö, or Ü, including Azerbaijani, Estonian, Finnish, Hungarian, Karelian, some of the Sami languages, Slovak, Swedish, and Turkish. This indicates sounds similar to the corresponding umlauted letters in German. In spoken Scandinavian languages the grammatical umlaut change is used (singular to plural, derivations, etc.) but the character used differs between languages. In Finnish, a/ä and o/ö change systematically in suffixes according to the rules of vowel harmony. In Hungarian, where long vowels are indicated with an acute accent, the umlaut notation has been expanded with a version of the umlaut which looks like double acute accents, indicating a blend of umlaut and acute. Contrast: short ö; long ő.

The Estonian alphabet has borrowed ⟨ä⟩, ⟨ö⟩, and ⟨ü⟩ from German; Swedish and Finnish have ⟨ä⟩ and ⟨ö⟩; and Slovak has ⟨ä⟩. In Estonian, Swedish, Finnish, and Sami ⟨ä⟩ and ⟨ö⟩ denote [æ] and [ø], respectively. Hungarian and Turkish have ⟨ö⟩ and ⟨ü⟩.

Slovak uses the letter ⟨ä⟩ to denote [e] (or a bit archaic but still correct [ɛɐ]). The sign is called dve bodky [ˈdʋe ˈbɔtki] ("two dots"), and the full name of the letter ä is široké e [ˈʂirɔkeː ˈe] ("wide e"). The similar word dvojbodka [ˈdʋɔjbɔtka] ("double dot") however refers to the colon.

In these languages, with the exception of Hungarian, the replacement rule for situations where the umlaut character is not available, is to simply use the underlying unaccented character instead. Hungarian follows the German rules and replaces ⟨ö⟩ and ⟨ü⟩ with ⟨oe⟩ and ⟨ue⟩ respectively[citation needed] – at least for telegrams and telex messages. The same rule is followed for the near-lookalikes ⟨ő⟩ and ⟨ű⟩.

In Luxembourgish (Lëtzebuergesch), ⟨ä⟩ and ⟨ë⟩ represent stressed [æ] and [ə] (schwa) respectively. The letters ⟨ü⟩ and ⟨ö⟩ do not occur in native Luxembourgish words, but at least the former is common in words borrowed from standard German.

When Turkish switched from the Arabic to the Latin alphabet in 1928, it adopted a number of diacritics borrowed from various languages, including ⟨ü⟩ and ⟨ö⟩ from German (probably reinforced by their use in languages like Swedish, Hungarian, etc.). These Turkish graphemes represent sounds similar to their respective values in German (see Turkish alphabet).

As the borrowed diacritic has lost its relationship to Germanic i-mutation, they are in some languages considered independent graphemes, and cannot be replaced with ⟨ae⟩, ⟨oe⟩, or ⟨ue⟩ as in German. In Estonian and Finnish, for example, these latter diphthongs have independent meanings. Even some Germanic languages, such as Swedish (which does have a transformation analogous to the German umlaut, called omljud), treat them always as independent letters. In collation, this means they have their own positions in the alphabet, for example at the end ("A–Ö" or "A–Ü", not "A–Z") as in Swedish, Estonian and Finnish, which means that the dictionary order is different from German. The transformations äae and öoe can, therefore, be considered less appropriate for these languages, although Swedish and Finnish passports use the transformation to render ö and ä (and å as aa) in the machine-readable zone. In contexts of technological limitation, e.g. in English based systems, Swedes can either be forced to omit the diacritics or use the two letter system.

When typing in Norwegian, the letters Æ and Ø might be replaced with Ä and Ö respectively if the former are not available. If ä is not available either, it is appropriate to use ae. The same goes for ö and oe. While ae has a great resemblance to the letter æ and, therefore, does not impede legibility, the digraph oe is likely to reduce the legibility of a Norwegian text. This especially applies to the digraph øy, which would be rendered in the more cryptic form oey. Also in Danish, Ö has been used in place of Ø in some older texts and to distinguish between open and closed ö-sounds and when confusion with other symbols could occur, e.g. on maps. The Danish/Norwegian Ø is like the German Ö a development of OE, to be compared with the French Œ.

Early Volapük used Fraktur a, o and u as different from Antiqua ones. Later, the Fraktur forms were replaced with umlauted vowels.

The usage of umlaut-like diacritic vowels, particularly ü, occurs in the romanization of languages that do not use the Roman alphabet, such as Chinese. For example, Mandarin Chinese [ny˨˩˦] ("female") is romanized as in Hanyu Pinyin. Tibetan pinyin uses ä, ö, ü with approximately their German values.

The Cyrillic letters ӓ, ӧ, ӱ are used in Mari, Khanty, and other languages for approximately [æ], [ø], and [y]. These directly parallel the German umlaut ä, ö, ü. Other vowels using a double dot to modify their values in various minority languages of Russia are ӛ, ӫ, and ӹ.

Use of the umlaut for special effect

See also: Metal umlaut

The two dot diacritic can be used in "sensational spellings" or foreign branding, for example in advertising, or for other special effects, where it is usually called an umlaut (rather than a diaeresis). Mötley Crüe, Blue Öyster Cult, Motörhead and Häagen-Dazs are examples of such usage.

Subscript umlaut

The International Phonetic Alphabet uses a double dot below a letter, a notation it calls "subscript umlaut" to indicate breathy (murmured) voice, (for example Hindi [kʊm̤ar] "potter".[7][c]: 25 ) The ALA-LC romanization system provides for its use and is one of the main schemes to romanize Persian (for example, rendering ض as ⟨z̤⟩). The notation was used to write some Asian languages in Latin script, for example Red Karen.

See also

Explanatory notes

  1. ^ The code-point shown here is for the generic combining character that may be used with any other symbol. When writing in European languages, it is generally more conventional (and convenient) to use a precomposed character.
  2. ^ Note that not all such combinations are necessarily umlauts: In the town names Coesfeld and Raesfeld, for example, the e merely lengthens the preceding vowel ([oː] and [aː], respectively).
  3. ^ The IPA Handbook calls the mark "subscript umlaut", in contrast with the Unicode Consortium's choice of "diaeresis below".


  1. ^ Hardwig, Florian. "Unusual Umlauts (German)". Typojournal. Retrieved 15 July 2015.
  2. ^ Hardwig, Florian (2013-05-29). "Jazz in Town Poster". Fonts in Use. Retrieved 15 July 2015.
  3. ^ "Flickr collection: vertical umlauts". Flickr. Retrieved 2021-08-07.
  4. ^ Hardwig, Florian (17 December 2014). "Compact umlaut". Fonts in Use. Retrieved 2021-08-07.
  5. ^ "DIN 5007-2: Ordnen von Schriftzeichenfolgen - Teil 2: Ansetzungsregeln für die alphabetische Ordnung von Namen" [DIN 5007-2: Ordering of character strings - Part 2: Preceding rules for the alphabetical order of names]. din.de. Retrieved 2023-08-10.
  6. ^ "Tipps & Tricks zu Access: Sortierreihenfolge auf Telefonbuch-Regeln umstellen" [Tips & Tricks for Access: Switch sorting order to phone book rules]. afz.bremen.de. Retrieved 2023-08-10.
  7. ^ International Phonetic Association (2021). Handbook of the International Phonetic Association : a guide to the use of the International Phonetic Alphabet. Cambridge: Cambridge University Press. ISBN 9780521652360..