I (い in hiragana or イ in katakana) is one of the Japanese kana each of which represents one mora. い is based on the sōsho style of the kanji character 以, and イ is from the radical (left part) of the kanji character 伊. In the modern Japanese system of sound order, it occupies the second position of the syllable chart, between あ and う. Additionally, it is the first letter in Iroha, before ろ. Both represent the sound [i]. In the Ainu language, katakana イ is written as y in their Latin-based syllable chart, and a small ィ after another katakana represents a diphthong.

Quick Facts transliteration, hiragana origin ...

i
hiragana katakana
transliteration	i
hiragana origin	以
katakana origin	伊
Man'yōgana	伊 怡 以 異 已 移 射 五
spelling kana	いろはのイ (Iroha no "i")

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Like other vowels, scaled-down versions of the kana (ぃ, ィ) are used to express sounds foreign to the Japanese language, such as フィ (fi). In some Okinawan writing systems, a small ぃ is also combined with the kana く (ku) and ふ to form the digraphs くぃ kwi and ふぃ hwi respectively, although the Ryukyu University system uses the kana ゐ/ヰ instead.

い comes from the left part of the Kanji 以, while イ originates from the left part of the Kanji 伊.^[1] An alternate form - 𛀆, based on the full cursive form of 以 is one of the most common hentaigana, as it merged with い late in the development of modern Japanese writing.

The Hiragana い is made in two strokes:

1. At the top left, a curved vertical stroke, ending with a hook at the bottom.
2. At the top right, a shorter stroke, slightly curving in the opposite direction.

The Katakana イ is made in two strokes:

1. At the top, a curved diagonal line going from right to left.
2. In the center of the last stroke, a vertical line going down.

• Full Braille representation

More information い / イ in Japanese Braille ...

い / イ in Japanese Braille
い / イ i	いい / イー ī	+い / +ー chōon*

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* When lengthening "-i" or "-e" syllables in Japanese braille, a chōon is always used, as is standard in katakana orthography, instead of adding the い / イ kana.

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