Acute accent

acuteĺsíneadh fada´accentfadaǼaccent aiguacutes
The acute accent is a diacritic used in many modern written languages with alphabets based on the Latin, Cyrillic, and Greek scripts.wikipedia
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Diacritic

diacriticsdiacritical markdiacritical marks
The acute accent is a diacritic used in many modern written languages with alphabets based on the Latin, Cyrillic, and Greek scripts.
Some diacritical marks, such as the acute ( ´ ) and grave ( ` ), are often called accents.

Apex (diacritic)

apexapices
An early precursor of the acute accent was the apex, used in Latin inscriptions to mark long vowels.
In written Latin, the apex (plural "apices") is a mark with roughly the shape of an acute accent which is placed over vowels to indicate that they are long.

Greek diacritics

polytonicpolytonic orthographymonotonic orthography
The acute accent was first used in the polytonic orthography of Ancient Greek, where it indicated a syllable with a high pitch.
The acute accent (´ ), the circumflex (ˆ ), and the grave accent (` ) indicate different kinds of pitch accent.

Greek alphabet

GreekGreek lettersGreek letter
The acute accent is a diacritic used in many modern written languages with alphabets based on the Latin, Cyrillic, and Greek scripts.
In the polytonic orthography traditionally used for ancient Greek, the stressed vowel of each word carries one of three accent marks: either the acute accent, the grave accent, or the circumflex accent (α̃ or α̑).

Welsh orthography

WelshWelsh spelling rulesWelsh alphabet
Welsh: word stress usually falls on the penultimate syllable, but one way of indicating stress on a final (short) vowel is by the use of the acute accent. In the Welsh orthography, it can be on any vowel: á, é, í, ó, ú, ẃ, or ý. Examples: casáu "to hate", sigarét "cigarette", ymbarél "umbrella".
The acute accent (acen ddyrchafedig), the grave accent (acen ddisgynedig), the circumflex (acen grom, to bach or hirnod) and the diaeresis mark (didolnod) are also used on vowels, but accented letters are not regarded as part of the alphabet.

Grave accent

graveùbackquote
Bulgarian: stress, which is variable in Bulgarian, is not usually indicated in Bulgarian except in dictionaries and sometimes in homonyms that are distinguished only by stress. However, Bulgarian usually uses the grave accent to mark the vowel in a stressed syllable, unlike Russian, which uses the acute accent.
The grave and circumflex have been replaced with an acute accent in the modern monotonic orthography.

Russian language

RussianRussian-languageRussian:
Russian. Stress is irregular in Russian, and in reference and teaching materials (dictionaries and books for children or foreigners), stress is indicated by an acute accent above the stressed vowel. The acute accent can be used both in the Cyrillic and sometimes in the romanised text.
Stress, which is unpredictable, is not normally indicated orthographically though an optional acute accent may be used to mark stress, such as to distinguish between homographic words, for example замо́к (zamók, meaning a lock) and за́мок (zámok, meaning a castle), or to indicate the proper pronunciation of uncommon words or names.

Spanish orthography

SpanishCastilianizedCastilian Spanish
Spanish marks stressed syllables in words that deviate from the standardized stress patterns. It is also used to distinguish homophones such as el (the) and él (he).
When acute accent and diaeresis marks are used on vowels (,,, and ) they are considered variants of the plain vowel letters, but is considered a separate letter from.

Pitch-accent language

pitch accentpitchaccent
The acute accent was first used in the polytonic orthography of Ancient Greek, where it indicated a syllable with a high pitch.
In polytonic orthography, accented vowels are marked with the acute accent.

Double acute accent

Őűdouble acute
Hungarian: í, ó, ú are the long equivalents of the vowels i, o, u. The ő, ű (see double acute accent) are the long equivalents of ö, ü. Both type of accents are known as hosszú ékezet (hosszú means long). The letters á and é are two long vowels but they are two vowels on their own rather than the long equivalents of a and e (see below in Letter extension).
In the 18th century, before Hungarian orthography became fixed, u and o with umlaut + acute were used in some printed documents.

Unicode

Unicode StandardUU+
However, for computer use, Unicode conflates the codepoints for these letters with those of the accented Latin letters of similar appearance.
For example, a Latin small letter "i" with an ogonek, a dot above, and an acute accent, which is required in Lithuanian, is represented by the character sequence U+012F, U+0307, U+0301.

Icelandic orthography

IcelandicIcelandic alphabetIcelandic writing system
In Icelandic the acute accent is used on all 6 of the vowels (a, e, i, o, u and y), and, like in Faroese, these are considered separate letters..]]
The Icelandic alphabet is a Latin-script alphabet including some letters duplicated with acute accents; in addition, it includes the letter eth, transliterated as d, and the runic letter thorn, transliterated as th (see picture); Ææ and Öö are considered letters in their own right and not a ligature or diacritical version of their respective letters.

Caron

háčekhačekǍ
When appearing in consonants, it indicates palatalization, similar to the use of the háček in Czech and other Slavic languages (e.g. sześć "six").
The name appears in most English dictionaries, but they treat the long mark (acute accent) differently.

Old Norse

NorseOld ScandinavianON
Old Norse: á, é, í, ó, ú, ý are the long versions of a, e, i, o, u, y. Sometimes, is used as the long version of, but is used more often. Sometimes, the short-lived Old Icelandic long (also written ) is written using an acute-accented form,, or a version with a macron,, but usually it is not distinguished from from which it is derived by u-mutation.
Long vowels are denoted with acutes.

Polish alphabet

PolishPolish spellingsdiacritic
In Kashubian and Polish, the acute on "ó", historically used to indicate a lenghthening of "o", now indicates higher pronunciation, and, respectively.
It is based on the Latin alphabet but includes certain letters with diacritics: the kreska or acute accent ; the overdot or kropka ; the tail or ogonek ; and the stroke . The letters q, v and x, which are used only in foreign words, are frequently not considered part of the Polish alphabet.

Lakota language

LakotaLakhotaStandard Lakota Orthography
Lakota. For example, kákhi "in that direction" but kakhí "take something to someone back there".
The vowels are a, e, i, o, u; nasal vowels are aŋ, iŋ, uŋ. Pitch accent is marked with an acute accent: á, é, í, ó, ú, áŋ, íŋ, úŋ on stressed vowels (which receive a higher tone than non-stressed ones)

É

Á

Á, á (a-acute) is a letter of the Blackfoot, Czech, Dutch, Faroese, Galician, Hungarian, Icelandic, Irish, Kazakh, Lakota, Navajo, Occitan, Portuguese, Sámi, Slovak, Spanish, Vietnamese, and Welsh languages as a variant of the letter a.

Ó

Ó, ó (o-acute) is a letter in the Czech, Emilian-Romagnol, Faroese, Hungarian, Icelandic, Kashubian, Kazakh, Polish, Slovak, and Sorbian languages.

Í

iıModel I
Í, í (i-acute) is a letter in the Faroese, Hungarian, Icelandic, Czech, Slovak, and Tatar languages, where it often indicates a long /i/ vowel.

Ń

Ń (minuscule: ń) is a letter formed by putting an acute accent over the letter N.

Armenian alphabet

ArmenianArmenian scriptՓ
* In the Armenian script emphasis on a word is marked by an acute accent above the word's stressed vowel; it is traditionally grouped with the Armenian question and exclamation marks which are also diacritics applied to the stressed vowel.
[ ՛ ] The shesht (which looks like a non-spacing acute accent) is used as an emphasis mark.

Ć

The grapheme Ć (minuscule: ć), formed from C with the addition of an acute accent, is used in various languages.

Vowel length

long vowellongshort
An early precursor of the acute accent was the apex, used in Latin inscriptions to mark long vowels.
Acute accent, used to indicate a long vowel in Czech, Slovak, Old Norse, Hungarian, Irish, and pre-20th-century transcriptions of Sanskrit, Arabic, etc.

Palatalization (phonetics)

palatalizedpalatalizationpalatalisation
When appearing in consonants, it indicates palatalization, similar to the use of the háček in Czech and other Slavic languages (e.g. sześć "six"). A graphically similar, but not identical, mark is indicative of a palatalized sound in several languages.
The Uralic Phonetic Alphabet marks palatalized consonants by an acute accent, as do some Finnic languages using the Latin alphabet, as in Võro.