Ï

{{Short description|Latin letter I with dieresis}}

{{redirect|I:|the vowel transcribed as [iː]|Close front unrounded vowel}}

{{for-multi|the Cyrillic letter Ї|Yi (Cyrillic)|the homographic Greek letter|ϊ}}

{{Infobox grapheme|name=I with Diaeresis|script=Latin script|fam1=IE|letter=Ï ï|image=Latin letter I with diaeresis.svg|imageclass=skin-invert-image|unicode=U+00CF, U+00EF|phonemes={{grid list

|[{{IPA link|ɯ}}]

|[{{IPA link|ɛ}}]

|[{{IPA link|i}}]

|[{{IPA link|ɨ}}]

|[{{IPA link|ɪ}}]

|[{{IPA link|ˈiː}}]

}}}}

Ï, lowercase ï, is a symbol used in various languages written with the Latin alphabet; it can be read as the letter I with diaeresis, I-umlaut or I-trema.

Initially in French and also in Afrikaans, Catalan, Dutch, Galician, Southern Sami, Welsh, and occasionally English, {{angle bracket|ï}} is used when {{angle bracket|i}} follows another vowel and indicates hiatus in the pronunciation of such a word. It indicates that the two vowels are pronounced in separate syllables, rather than together as a diphthong or digraph. For example, French maïs ({{IPA|fr|ma.is|IPA|LL-Q150 (fra)-Fhala.K-maïs.wav}}; "maize"); without the diaeresis, the {{angle bracket|i}} is part of the digraph {{angle bracket|ai}}: mais ({{IPA|fr|mɛ|IPA|fr-mais.ogg}}; *but"). The letter is also used in the same context in Dutch, as in Oekraïne ({{IPA|nl|ukraːˈ(j)inə|pron|nl-Oekraïne.ogg}} *{{IPA|nl|uˈkrɑinə|label=and not}}; "Ukraine"), and English naïve ({{IPAc-en|n|ɑː|ˈ|iː|v}} {{respell|nah|EEV}} or {{IPAc-en|n|aɪ|ˈ|iː|v}} {{respell|ny|EEV}}).

The letter is also used in Ukrainian.

In scholarly writing on Turkic languages, {{angbr|ï}} is sometimes used to write the close back unrounded vowel {{IPA|/ɯ/}}, which, in the standard modern Turkish alphabet, is written as the dotless i {{angbr|ı}}.Marcel Erdal, A Grammar of Old Turkic, Handbook of Oriental Studies 3, {{ISBN|9004102949}}, 2004, p. 52 The back neutral vowel reconstructed in Proto-Mongolic is sometimes written {{angbr|ï}}.Juha Janhunen, ed., The Mongolic Languages {{ISBN|0415681545}}, p. 5

In the transcription of Amazonian languages, {{angbr|ï}} is used to represent the high central vowel {{IPAblink|ɨ}}.

It is also a transliteration of the rune ᛇ.