Double-struck Italic Small J
Part of Math Symbols
Double-struck Italic Small J has no standard Windows Alt code. Copy the character directly, or use its HTML entity or Unicode value instead.
- Alt code
- None
- HTML entity
- ⅉ
- Unicode
- U+2149
About this symbol
ⅉ, a double-struck italic j, is one way of writing the imaginary unit, the square root of −1, as electrical engineers do. They use j because i already stands for electric current.
Unicode facts
- Official name
- DOUBLE-STRUCK ITALIC SMALL J
- Type
- Lowercase letter
- Unicode block
- Letterlike Symbols
- Unicode group
- Double-struck italic math symbols
- Added in
- Unicode 3.2 (2002)
- Unicode notes
- Sometimes used for the imaginary unit
Click the symbol or any value at the top of the page to copy it. See the full Math Symbols chart for related characters.