What is the small kana "tsu" used for?
The small tsu is used to represent a doubled or "geminate" consonant, known as a sokuon ( 促音) in Japanese. The sokuon is usually represented in romanized Japanese by a doubled consonant, such as the double t in hatto ( ハット ), "hat". For example, "Pocky", a kind of snack, is written in kana as ポッキー, which is ポ, "po", ッ ( sokuon ), キ, "ki", and ー ( chōon) (see What is the long line symbol used in …
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