UnicodeCharactercom
𝐉
U+1D409 Β· MATHEMATICAL BOLD CAPITAL J

Mathematical Bold Capital J

  • CodepointU+1D409
  • NameMATHEMATICAL BOLD CAPITAL J
  • Decimal119817
  • 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+1D409 (𝐉) is MATHEMATICAL BOLD CAPITAL J, 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+004A J (compatibility decomposition <font>). NFC and NFD leave it alone, but NFKC and NFKD replace it with U+004A J. Search engines, identifier checks and username systems that apply NFKC will treat the two as the same text.

How to type 𝐉

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Encodings & escapes

UTF-8 encoder β†’
UTF-8F0 9D 90 894 bytes
UTF-16D835 DC09surrogate pair
UTF-320001D4094 bytes
HTML decimal&#119817;
HTML hex&#x1D409;
CSS\1D409in content: "…"
JavaScript\u{1D409}ES2015+
JavaScript\uD835\uDC09surrogate pair
JSON\uD835\uDC09
Python\U0001D409
Python\N{MATHEMATICAL BOLD CAPITAL J}by name
Java / C#\uD835\uDC09
C / C++\U0001D409universal character name
Rust / Swift / PHP\u{1D409}
Go\U0001D409
Ruby\u{1D409}
Excel / Sheets=UNICHAR(119817)
URL-encoded%F0%9D%90%89percent-encoded UTF-8
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Normalization forms

Normalizer β†’
NFCunchanged
NFDunchanged
NFKCU+004A J
NFKDU+004A J
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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+004AJLatin Capital Letter J U+037FΝΏGreek Capital Letter Yot U+0408ЈCyrillic Capital Letter Je U+FF2AοΌͺFullwidth Latin Capital Letter J U+1D43D𝐽Mathematical Italic Capital J U+1D471𝑱Mathematical Bold Italic Capital J U+1D4A5π’₯Mathematical Script Capital J U+1D4D9𝓙Mathematical Bold Script Capital J U+1D50D𝔍Mathematical Fraktur Capital J U+1D541𝕁Mathematical Double-Struck Capital J U+1D575𝕡Mathematical Bold Fraktur Capital J U+1D5A9𝖩Mathematical Sans-Serif Capital J U+1D5DD𝗝Mathematical Sans-Serif Bold Capital J U+1D611π˜‘Mathematical Sans-Serif Italic Capital J U+1D645𝙅Mathematical Sans-Serif Bold Italic Capital J U+1D679𝙹Mathematical Monospace Capital J
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Nearby in Mathematical Alphanumeric Symbols

All in block β†’
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+1D408𝐈Mathematical Bold Capital I 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 U+1D40F𝐏Mathematical Bold Capital P