Unicode Character "𝐈" (U+1D408)

The character 𝐈 (Mathematical Bold Capital I) is represented by the Unicode codepoint U+1D408. It is encoded in the Mathematical Alphanumeric Symbols block, which belongs to the Supplementary Multilingual Plane. It was added to Unicode in version 3.1 (March, 2001). It is HTML encoded as 𝐈.

Main Unicode Properties

Name Mathematical Bold Capital I
Unicode Codepoint U+1D408
Unicode Version 3.1 (March, 2001)
Block Mathematical Alphanumeric Symbols
Plane Supplementary Multilingual Plane

Bidirectional Data

Bidirectional class Left To Right (L)
Is mirrored? No

Other Unicode Data

Category Uppercase Letter
Script Code for undetermined script
Combining Class Not Reordered
Decomposition mapping

U+1D408 Conversion

HTML (decimal) 𝐈
HTML (hex) 𝐈
HTML (named) -
URL Escape Code %F0%9D%90%88
CSS \01D408
JavaScript, JSON \u1D408
C, C++, Java \u1D408
Python \u1D408
Rust \u{1D408}
Ruby \u1D408

How to type "𝐈"

  • Windows ?: Hold Alt, then type 1 D 4 0 8. Release Alt.
  • Mac ?: Hold Alt ⌥, then type D 8 3 5 D C 0 8. Release Alt.


  • 𝐈
    Times, Times New Roman, serif
  • 𝐈
    Helvetica, Arial, sans-serif
  • 𝐈
    Courier, Courier New, monospace

UTF Encodings

UTF-8 (hex) 0xF0 0x9D 0x90 0x88
UTF-16 (hex) 0xD835 0xDC08
UTF-32 (hex) 0x0001D408