Black-letter Capital I
Part of Math Symbols
Black-letter Capital I has no standard Windows Alt code. Copy the character directly, or use its HTML entity or Unicode value instead.
- Alt code
- None
- HTML entity
- ℑ
- Unicode
- U+2111
About this symbol
ℑ, a black-letter I, stands for the imaginary part of a complex number: ℑ(3 + 4i) is 4. With ℜ, the real part, it splits a complex number in two.
Unicode facts
- Official name
- BLACK-LETTER CAPITAL I
- Also called
- Imaginary part
- Type
- Uppercase letter
- Unicode block
- Letterlike Symbols
- Added in
- Unicode 1.1 (1993)
Click the symbol or any value at the top of the page to copy it. See the full Math Symbols chart for related characters.