This one is U+4E00, CJK Unified Ideograph-4E00. So it's a common character between Chinese, Japanese, and Korean. This should be "one" in all three. And it does technically look a little different than a dash: https://unicodeplus.com/U+4E00
And this is different from Japanese's chuuonpu (U+30FC) which is a vowel elongation mark, and it's rendered horizontally or vertically depending on whether the text direction is horizontal or vertical, respectively.
