Û, û (u-circumflex) is a letter of the Emilian-Romagnol, 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.
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Afrikaans
In Afrikaans, û is a punctuated form of u and a usage example includes "brûe", plural of "brug" (= bridge).
Emilian-Romagnol
Û is used to represent [uː] in Emilian dialects, e.g. Bolognese anvûd [aŋˈvuːd] "nephews".
French
In French, û does not change the pronunciation of the letter u. In some words, it is used to differentiate two homographs (such as jeune "young" versus jeûne "a fast"). In certain other words such as mû, the circumflex has no disambiguating value; attempts have been made to abolish it in words such as these. See use of the circumflex in French. Û also often appears in words which used to have an "s" after the "u" but the "s" disappeared from the word over time. An example of this is the French word for August: août. In English, the 's' was kept, but in French it disappeared and was replaced by adding an accent circumflex to the previous vowel. See use of the accent circumflex in French.
Friulian
Û is used to represent the sound /uː/.
Kurdish
Û is used in Latin Kurmanjî in the Kurdish alphabet to represent a close central rounded vowel, /ʉ/.
Turkish
Û is used to indicate the consonant before "u" is palatalized, as in "sükûnet" (quietness), pronounced /sycuːˈnet/.
Welsh
In Welsh, û is used to represent long stressed u [ɨː] or [iː] when, without the circumflex, the vowel would be pronounced as short [ɨ] or [ɪ], e.g., cytûn [kəˑtɨːn, kəˑtiːn] "agreed", or in bûm [bɨːm, biːm] "I was", as opposed to bum [bɨm, bɪm] "five" (soft-mutated prenominal form).
Masovian Dialect
In Masovian alphabet, û is used to represent /ju:/.