ÿ

Y with diaeresis
Y with diaeresis
Ÿ ÿ
Usage
History
Development	Y y Ÿ ÿ;
Other
	This article contains phonetic transcriptions in the International Phonetic Alphabet (IPA). For an introductory guide on IPA symbols, see Help:IPA. For the distinction between [ ], / / and ⟨ ⟩, see IPA § Brackets and transcription delimiters.

ÿ is a Latin script character composed of the letter Y and the diaeresis diacritical mark. It occurs in French as a variant of ⟨ï⟩ in a few proper nouns, as in the name of the Parisian suburb of L'Haÿ-les-Roses [la.i le ʁoz] and in the surname of the house of Croÿ [kʁu.i].^[1] It occurs in a few Hungarian names as well, such as Lajos Méhelÿ and Margit Danÿ.

As a diaeresis is never used on the first letter of a word and all-caps text typically omitted all accents, there was assumed to be no need for an uppercase ⟨Ÿ⟩ when computer character sets such as CP437 and ISO 8859-1 were designed. However much software assumes that conversion from lower-case to upper-case and then back again is lossless, so ⟨Ÿ⟩ was added to many character sets such as CP1252, ISO 8859-15, and Unicode. This also happened to a more prominent character, the German ß.

IPA uses ⟨ÿ⟩ to transcribe the close central compressed vowel, a type of vowel sound used in some spoken languages.

The character has also found use as a metal umlaut.

The lowercase ÿ has the Unicode code U+00FF, or 255, making it often appear when binary files are opened as text files.

In Unicode

U+00FF ÿ LATIN SMALL LETTER Y WITH DIAERESIS
U+0178 Ÿ LATIN CAPITAL LETTER Y WITH DIAERESIS

References

^ "French Language Information". Lingvozoft.

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[1] "French Language Information". Lingvozoft.

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