Turned Greek Small Letter Iota
Part of Math Symbols
Turned Greek Small Letter Iota has no standard Windows Alt code. Copy the character directly, or use its HTML entity or Unicode value instead.
- Alt code
- None
- HTML entity
- ℩
- Unicode
- U+2129
About this symbol
℩, a turned iota, is the definite description of logic: ℩x means “the one x such that”. Bertrand Russell and Alfred North Whitehead used it in Principia Mathematica, from 1910, as part of Russell’s theory of descriptions.
Unicode facts
- Official name
- TURNED GREEK SMALL LETTER IOTA
- Type
- Symbol
- Unicode block
- Letterlike Symbols
- Added in
- Unicode 1.1 (1993)
- Unicode notes
- Unique element fulfilling a description (logic)
Click the symbol or any value at the top of the page to copy it. See the full Math Symbols chart for related characters.