U is one of the 12 Vietnamese language vowels. It is pronounced .

U or u is a letter in the Belarusian language, when written in the 20th century form of the Belarusian Latin alphabet, and is also a letter in the Esperanto alphabet. The accent mark (diacritic) is known as a breve.

U (named u , plural ues) is the twenty-first letter in the ISO basic Latin alphabet and a vowel in the English alphabet. It is the chemical symbol for uranium.

Ú or ú (U with acute) is a Latin letter used in the Czech, Faroese, Hungarian, Icelandic, and Slovak writing systems. This letter also appears in Dutch, Irish, Occitan, Pinyin, Portuguese, Spanish, Italian, and Vietnamese as a variant of the letter "U".

(u-circumflex) is a letter of the French, Friulian, Kurdish, and Turkish alphabets. This letter was used in the ISO 9:1995 system of Cyrillic transliteration as the letter Ю and also in Wade-Giles (one of the romanization systems in Chinese) for apical dental unrounded vowel as in tzû, tz'û, ssû, corresponds to present zi, ci, si in Pinyin respectively. It is also in Taos.

Ü, or ü, is a character which typically represents a close front rounded vowel  . It is classified as a separate letter in several extended Latin alphabets, or alternatively as the letter U with an umlaut/diaeresis in others.

Backspace is the keyboard key that originally pushed the typewriter carriage one position backwards, and in modern computer displays moves the cursor one position backwards, deletes the preceding character, and shifts back the text after it by one position.

A caron ( ˇ ) or háček (; from Czech háček ), also known as a wedge, inverted circumflex, inverted hat, is a diacritic placed over certain letters to indicate present or historical palatalization, iotation, or postalveolar pronunciation in the orthography of some Baltic, Slavic, Finno-Lappic, and other languages. The caron also indicates the third tone (falling and then rising) in the Pinyin romanization of Mandarin Chinese.

The double acute accent ( ˝ ) is a diacritic mark of the Latin script. It is used primarily in written Hungarian, and consequently is sometimes referred to as Hungarumlaut, a portmanteau of Hungarian umlaut. The signs formed with diacritic marks are letters in their own right in the Hungarian alphabet (for instance, they are separate letters for the purpose of collation).

The grave accent ( ` ) ( or ) is a diacritical mark used in written Breton, Catalan, Corsican, Dutch, French, Greek (until 1982; see polytonic orthography), Italian,  Macedonian, Mohawk, Norwegian, Occitan, Portuguese, Ligurian, Scottish Gaelic, Vietnamese, Welsh, Romansh, and other languages.

A macron, from the Greek  (makrón), meaning "long", is a diacritic placed above a vowel (and, more rarely, under or above a consonant). It was originally used to mark a long or heavy syllable in Greco-Roman metrics, but now marks a long vowel. In the International Phonetic Alphabet the macron is used to indicate mid tone; the sign for a long vowel is a modified triangular colon ⟨⟩.

The ogonek (Polish , "little tail", the diminutive of ogon; Lithuanian nosine) is a diacritic hook placed under the lower right corner of a vowel in the Latin alphabet used in several European and Native American languages.

A ring diacritic may appear above or below letters. It may be combined with some letters of the extended Latin alphabets in various contexts.

The tilde (, ; ˜ or ~ ) is a grapheme with several uses. The name of the character comes from Portuguese and Spanish, from the Latin  meaning "title" or "superscription", though the term "tilde" has evolved and now has a different meaning in linguistics.

The Ustaša - Croatian Revolutionary Movement (, before 1933 it was called Ustaša - Croatian Revolutionary Organization; ; members known collectively as Ustaše, but sometimes anglicised as Ustashe, Ustashas or Ustashi) was a Croatian fascist movement. The ideology of the movement was a blend of Nazism and Croatian nationalism. The Ustaše supported the creation of a Greater Croatia that would span to the River Drina and to the border of Belgrade. The movement emphasized the need for a racially "pure" Croatia and promoted persecution and genocide against Serbs, Jews and Romani people. Fiercely nationalistic, the Ustaše were also fanatically Catholic. In the Yugoslav political context, they identified Catholicism with Croatian nationalism. Following Croatian nationalism, they declared the Catholic and Muslim faiths as religions of the Croatian people. The Ustaše also saw the Islam of Bosniaks as a religion which "keeps true the blood of Croats."