UnicodeCharactercom
𝐈
U+1D408 Β· MATHEMATICAL BOLD CAPITAL I

Mathematical Bold Capital I

  • CodepointU+1D408
  • NameMATHEMATICAL BOLD CAPITAL I
  • Decimal119816
  • BlockMathematical Alphanumeric Symbols (U+1D400–U+1D7FF)
  • Plane1 β€” Supplementary Multilingual Plane
  • ScriptCommon
  • CategoryLu β€” Uppercase Letter
  • Unicode version3.1 (2001)
  • Bidi classL β€” Left-to-Right
  • Combining class0
  • East Asian widthN β€” Neutral
  • MirroredNo

About this character

U+1D408 (𝐈) is MATHEMATICAL BOLD CAPITAL I, an uppercase letter in the Mathematical Alphanumeric Symbols block. Its script is Common: it is shared by many writing systems rather than belonging to one. It was added in Unicode 3.1 (2001).

It is a font variant of U+0049 I (compatibility decomposition <font>). NFC and NFD leave it alone, but NFKC and NFKD replace it with U+0049 I. Search engines, identifier checks and username systems that apply NFKC will treat the two as the same text.

How to type 𝐈

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Encodings & escapes

UTF-8 encoder β†’
UTF-8F0 9D 90 884 bytes
UTF-16D835 DC08surrogate pair
UTF-320001D4084 bytes
HTML decimal&#119816;
HTML hex&#x1D408;
CSS\1D408in content: "…"
JavaScript\u{1D408}ES2015+
JavaScript\uD835\uDC08surrogate pair
JSON\uD835\uDC08
Python\U0001D408
Python\N{MATHEMATICAL BOLD CAPITAL I}by name
Java / C#\uD835\uDC08
C / C++\U0001D408universal character name
Rust / Swift / PHP\u{1D408}
Go\U0001D408
Ruby\u{1D408}
Excel / Sheets=UNICHAR(119816)
URL-encoded%F0%9D%90%88percent-encoded UTF-8
Β§

Normalization forms

Normalizer β†’
NFCunchanged
NFDunchanged
NFKCU+0049 I
NFKDU+0049 I
Β§

Looks similar

Characters that Unicode’s security data (UTS #39 confusables) lists as visually confusable with this one. Useful for spotting lookalike spoofing in URLs and usernames.

U+00311Digit One U+0049ILatin Capital Letter I U+006ClLatin Small Letter L U+007C|Vertical Line U+0196Ζ–Latin Capital Letter Iota U+01C0Η€Latin Letter Dental Click U+0399Ξ™Greek Capital Letter Iota U+0406Π†Cyrillic Capital Letter Byelorussian-Ukrainian I U+04C0Σ€Cyrillic Letter Palochka U+05C0Χ€Hebrew Punctuation Paseq U+05D5Χ•Hebrew Letter Vav U+05DFןHebrew Letter Final Nun U+0627Ψ§Arabic Letter Alef U+0661Ω‘Arabic-Indic Digit One U+06F1Ϋ±Extended Arabic-Indic Digit One U+16C1ᛁRunic Letter Isaz Is Iss I
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Nearby in Mathematical Alphanumeric Symbols

All in block β†’
U+1D402𝐂Mathematical Bold Capital C U+1D403𝐃Mathematical Bold Capital D U+1D404𝐄Mathematical Bold Capital E U+1D405𝐅Mathematical Bold Capital F U+1D406𝐆Mathematical Bold Capital G U+1D407𝐇Mathematical Bold Capital H U+1D409𝐉Mathematical Bold Capital J U+1D40A𝐊Mathematical Bold Capital K U+1D40B𝐋Mathematical Bold Capital L U+1D40C𝐌Mathematical Bold Capital M U+1D40D𝐍Mathematical Bold Capital N U+1D40E𝐎Mathematical Bold Capital O