Ӏ

Etymology
From. The Cyrillic form was originally the Roman numeral Ⅰ that was furnished on most Russian manual typewriters. The Roman I key did double duty for the Hindu-Arabic digit 1.

Usage notes
Often the capital Roman numeral or the Hindu-Arabic digit  is used instead of the Unicode palochka. For some languages, such as Chechen, national keyboards do not include a key specifically for a palochka, and so the Roman numeral or the digit is in standard use.