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Small capital I is an additional letter of the Latin alphabet similar in its dimensions to the letter "i" but with a shape based on ⟨I⟩, its capital form. Although ⟨ɪ⟩ is usually an allograph of the letter I, it is considered as an additional letter in the African reference alphabet and has been used as such in some publications in Kulango languages in Côte d'Ivoire in the 1990s. In the International Phonetic Alphabet, the lowercase small capital I /ɪ/ is used as the symbol for near-close near-front unrounded vowel.
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Encoding
Until Unicode 8.0.0 (2015), uppercase I with crossbars was not yet encoded. To fill out the gap, a number of fonts contained a non-standard glyph, or used a code point from Private Use Area of Unicode. But this oddity has gone since the 9.0 version of Unicode (2016).
BFGlyphs
In serif (and some other) typefaces the letter "ɪ" usually has two crossbars, which distinguishes it from the lowercase "ı" (dotless I), otherwise homoglyphical, but whose upper serif has another configuration.
In sans-serif typefaces it usually doesn't have crossbars.