Double acute accent

The Chuvash language written in the Cyrillic script uses a double-acute Ӳ, ӳ /y/ as a front counterpart of Cyrillic letter У, у /u/ (see Chuvash vowel harmony), likely after the analogy of handwriting in Latin script languages.

[4] In other minority languages of Russia (Khakas, Mari, Altai, and Khanty), the umlauted form Ӱ is used instead.

One may encounter this use as a tone sign in some IPA-derived orthographies of minority languages, such as in the North American Native Tanacross (Athapascan).

Unicode encodes a number of cases of "letter with double acute" as precomposed characters and these are displayed below.

O and U with double acute accents are supported in the Code page 852, ISO 8859-2, and Unicode character sets.

For example, the name Paul Erdős (in his native Hungarian: Erdős Pál) would be typeset as In modern X11 systems (or utilities such as WinCompose on Windows systems), the double acute can be typed by pressing the Compose key followed by = (the equal sign) and desired letter (o or u).