So I know the っ character is used to create a “geminate” consonant as in a doubling of a consonant but why this one? Like what is the history beyond its uses and how did it come about in usage? It seems kinda random to pick this character for something like that or maybe I’m overlooking something…
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Quick google for “history small tsu” returns this as the first hit.
https://japanese.stackexchange.com/questions/751/how-did-little-tsu-become-a-lengthener