I with macron (Cyrillic)

Long I or I with macron is a letter of the Cyrillic script. In Tajik, it represents a stressed close front unrounded vowel at the end of a word. In Kildin Sami on the Kola Peninsula and Mansi in western Siberia, it represents long. Both these sounds are pronounced like the ee in “feet”. In those languages, vowel length is distinctive, and the macron marks the long version of vowels.
I with macron is also used in Aleut. It is the sixteenth letter of the modern Aleut alphabet. It looks similar to the Short I and often written identically in some cursive scripts. It is also used to substitute this letter in some fonts.
I with macron also appears in the Bulgarian and Serbian languages.

Usage

South Slavic languages

I with macron is used in some of the South Slavic languages, mainly Bulgarian and Serbian for two-syllable offset based on the old Slavic accent law, to become easy for the accent analogy to pass in separate words, to become lexical. as the analogy passed through three-syllable oxytones with a tonal pattern: тетӣвà. I with macron is also sometimes used as a form of Short I.