Dotted and dotless I in computing

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Dotted İ i and dotless I ı are distinct letters in the Latin alphabets of a number of Turkic languages including Turkish, Azerbaijani, and Kazakh. They are also used by the common Turkic Alphabet:

• Dotless I, I ı, usually denotes the close back unrounded vowel sound (/ɯ/). Neither the upper nor the lower case version has a dot.
• Dotted İ, İ i, usually denotes the close front unrounded vowel sound (/i/). Both the upper and lower case versions have a dot.

Examples:

• İstanbul /isˈtanbuɫ/ is the Turkish spelling for Istanbul. It starts with an i sound in standard dialect of Turkish, not an ı.
• Diyarbakır /diˈjaɾbakɯɾ/ is the Turkish spelling for Diyarbakır. In Turkish the first and last vowels are spelled and pronounced differently.
• Bakı /bɑˈcɯ/ is the Azerbaijani spelling for Baku.

In contrast, the letter j never has this distinction in these languages, with a dot in the lower case character: J j, but the dotless j does exist in Unicode: ȷ. That letter is sometimes used in mathematics with a combining hat to indicate a unit vector.

In English and most languages using the Latin script, the capital i is dotless (I) while the lowercase i has a dot on it. (i)