し, in hiragana, or シ in katakana, is one of the Japanese kana, which each represent one mora.

The katakana form has become increasingly popular as an emoticon in the Western world due to its resemblance to a smiling face.

This character may be combined with a dakuten, forming じ in hiragana, ジ in katakana, and ji in Hepburn romanization; the pronunciation becomes /zi/ (phonetically [d͡ʑi] or [ʑi] in the middle of words).

The dakuten form of this character is used when transliterating "di" occasionally, as opposed to チ's dakuten form, or a de assigned to a small i; for example, Aladdin is written as アラジン Arajin, and radio is written as ラジオ.

It can also be written as a small ㇱ to represent a final s sound, pronounced ɕ.