Ya with diaeresis
Ya with diaeresis (Я̈ я̈; italics: Я̈ я̈) is a letter of the Cyrillic script.

Ya with diaeresis is used in the Selkup language.

In Russian, ya with diaeresis saw rare use prior to the 1918 orthography reform to indicate that a stressed letter ya () should be pronounced as  instead of the expected , in a similar fashion to the role of yo (). For example, the modern pronouns  and  were formerly spelled  and  in the genitive and possessive, due to their historical pronunciations as  and , which had since shifted to  and . As with the letter yo, use of the diaeresis was rare outside of learning materials and dictionaries, and following the reform the letter was replaced with yo outright.

See also
Cyrillic characters in Unicode

References

Cyrillic letters with diacritics
Letters with diaeresis