UnicodeCharactercom
𝔹
U+1D539 Β· MATHEMATICAL DOUBLE-STRUCK CAPITAL B

Mathematical Double-Struck Capital B

  • CodepointU+1D539
  • NameMATHEMATICAL DOUBLE-STRUCK CAPITAL B
  • Decimal120121
  • 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+1D539 (𝔹) is MATHEMATICAL DOUBLE-STRUCK CAPITAL B, 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+0042 B (compatibility decomposition <font>). NFC and NFD leave it alone, but NFKC and NFKD replace it with U+0042 B. Search engines, identifier checks and username systems that apply NFKC will treat the two as the same text.

How to type 𝔹

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Encodings & escapes

UTF-8 encoder β†’
UTF-8F0 9D 94 B94 bytes
UTF-16D835 DD39surrogate pair
UTF-320001D5394 bytes
HTML named&Bopf;named character reference
HTML decimal&#120121;
HTML hex&#x1D539;
CSS\1D539in content: "…"
JavaScript\u{1D539}ES2015+
JavaScript\uD835\uDD39surrogate pair
JSON\uD835\uDD39
Python\U0001D539
Python\N{MATHEMATICAL DOUBLE-STRUCK CAPITAL B}by name
Java / C#\uD835\uDD39
C / C++\U0001D539universal character name
Rust / Swift / PHP\u{1D539}
Go\U0001D539
Ruby\u{1D539}
Excel / Sheets=UNICHAR(120121)
URL-encoded%F0%9D%94%B9percent-encoded UTF-8
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Normalization forms

Normalizer β†’
NFCunchanged
NFDunchanged
NFKCU+0042 B
NFKDU+0042 B
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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+0042BLatin Capital Letter B U+0392Ξ’Greek Capital Letter Beta U+0412Π’Cyrillic Capital Letter Ve U+212CℬScript Capital B U+FF22οΌ’Fullwidth Latin Capital Letter B U+1D401𝐁Mathematical Bold Capital B U+1D435𝐡Mathematical Italic Capital B U+1D469𝑩Mathematical Bold Italic Capital B U+1D4D1𝓑Mathematical Bold Script Capital B U+1D505𝔅Mathematical Fraktur Capital B U+1D56D𝕭Mathematical Bold Fraktur Capital B U+1D5A1𝖑Mathematical Sans-Serif Capital B U+1D5D5𝗕Mathematical Sans-Serif Bold Capital B U+1D609π˜‰Mathematical Sans-Serif Italic Capital B U+1D63D𝘽Mathematical Sans-Serif Bold Italic Capital B U+1D671𝙱Mathematical Monospace Capital B
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Nearby in Mathematical Alphanumeric Symbols

All in block β†’
U+1D533𝔳Mathematical Fraktur Small V U+1D534𝔴Mathematical Fraktur Small W U+1D535𝔡Mathematical Fraktur Small X U+1D536𝔢Mathematical Fraktur Small Y U+1D537𝔷Mathematical Fraktur Small Z U+1D538𝔸Mathematical Double-Struck Capital A U+1D53B𝔻Mathematical Double-Struck Capital D U+1D53C𝔼Mathematical Double-Struck Capital E U+1D53D𝔽Mathematical Double-Struck Capital F U+1D53E𝔾Mathematical Double-Struck Capital G