- Roman numeral one (1)
- (ordinal, especially in the names of aristocracy) the first.
- (music) major tonic triad
This symbol is the pre-combined Unicode glyph for the Roman numeral one, mainly intended for compatibility with large East-Asian character sets. It is used to represent the individual number where individual glyphs are not wanted. Otherwise, the Roman numeral one is written as the sequence “I” .