Ÿ

{{Short description|Latin letter Y with diaeresis}}

{{Lowercase title}}

{{for|the sound represented as /ÿ/|Close central rounded vowel#Close central compressed vowel}}

{{distinguish|text=ij (digraph), which may look like ÿ in Dutch handwriting, or with Cyrillic U with diaeresis}}

{{more citations needed|date=May 2023}}

{{Infobox grapheme

|name=Y with diaeresis

|letter=Ÿ ÿ

|fam1=Y y

|image=Latin letter Y with diaeresis.svg

|imageclass=skin-invert-image

}}

ÿ is a Latin script character composed of the letter Y and the diaeresis diacritical mark. It occurs in French as a variant of {{angbr|ï}} in a few proper nouns, as in the name of the Parisian suburb of L'Haÿ-les-Roses {{IPA|[la.i le ʁoz]}} and in the surname of the house of Croÿ {{IPA|[kʁu.i]}}.{{cite web |title=French Language Information |url=https://www.lingvozone.com/French |website=Lingvozoft}} 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 {{angbr|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 {{angbr|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 {{angbr IPA|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.