In S01E03 of maniac we can see this bag:
What is the symbol between テ and ー ? Is it supposed to be 1, like for version 1? If so shouldn't it go after the ー?
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It is not a number 1, as you might think. It is a valid katakana which is a small イ: ィ.
The word in question is then:
These kind of small kana are used in conjunction with the previous kana in order to modify the sound. In this case, where the kana is テ and gives a 'te' sound, adding the small kana ィ in front to make ティ gives the 'ti' sound that normally can't be expressed in the standard kana range. Recall that the normal sound for the 'i' range in the た row gives us ち or チ 'chi'.
So, now that you know this, what word is this?
It is a small イ.
It is called sutegana.