UnicodeCharactercom
𝕛
U+1D55B Β· MATHEMATICAL DOUBLE-STRUCK SMALL J

Mathematical Double-Struck Small J

  • CodepointU+1D55B
  • NameMATHEMATICAL DOUBLE-STRUCK SMALL J
  • Decimal120155
  • BlockMathematical Alphanumeric Symbols (U+1D400–U+1D7FF)
  • Plane1 β€” Supplementary Multilingual Plane
  • ScriptCommon
  • CategoryLl β€” Lowercase Letter
  • Unicode version3.1 (2001)
  • Bidi classL β€” Left-to-Right
  • Combining class0
  • East Asian widthN β€” Neutral
  • MirroredNo

About this character

U+1D55B (𝕛) is MATHEMATICAL DOUBLE-STRUCK SMALL J, a lowercase 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+006A j (compatibility decomposition <font>). NFC and NFD leave it alone, but NFKC and NFKD replace it with U+006A 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 95 9B4 bytes
UTF-16D835 DD5Bsurrogate pair
UTF-320001D55B4 bytes
HTML named&jopf;named character reference
HTML decimal&#120155;
HTML hex&#x1D55B;
CSS\1D55Bin content: "…"
JavaScript\u{1D55B}ES2015+
JavaScript\uD835\uDD5Bsurrogate pair
JSON\uD835\uDD5B
Python\U0001D55B
Python\N{MATHEMATICAL DOUBLE-STRUCK SMALL J}by name
Java / C#\uD835\uDD5B
C / C++\U0001D55Buniversal character name
Rust / Swift / PHP\u{1D55B}
Go\U0001D55B
Ruby\u{1D55B}
Excel / Sheets=UNICHAR(120155)
URL-encoded%F0%9D%95%9Bpercent-encoded UTF-8
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Normalization forms

Normalizer β†’
NFCunchanged
NFDunchanged
NFKCU+006A j
NFKDU+006A 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+006AjLatin Small Letter J U+03F3Ο³Greek Letter Yot U+0458јCyrillic Small Letter Je U+2149β…‰Double-Struck Italic Small J U+FF4AｊFullwidth Latin Small Letter J U+1D423𝐣Mathematical Bold Small J U+1D457𝑗Mathematical Italic Small J U+1D48B𝒋Mathematical Bold Italic Small J U+1D4BF𝒿Mathematical Script Small J U+1D4F3𝓳Mathematical Bold Script Small J U+1D527𝔧Mathematical Fraktur Small J U+1D58F𝖏Mathematical Bold Fraktur Small J U+1D5C3𝗃Mathematical Sans-Serif Small J U+1D5F7𝗷Mathematical Sans-Serif Bold Small J U+1D62B𝘫Mathematical Sans-Serif Italic Small J U+1D65Fπ™ŸMathematical Sans-Serif Bold Italic Small J
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Nearby in Mathematical Alphanumeric Symbols

All in block β†’
U+1D555𝕕Mathematical Double-Struck Small D U+1D556𝕖Mathematical Double-Struck Small E U+1D557𝕗Mathematical Double-Struck Small F U+1D558π•˜Mathematical Double-Struck Small G U+1D559𝕙Mathematical Double-Struck Small H U+1D55Aπ•šMathematical Double-Struck Small I U+1D55Cπ•œMathematical Double-Struck Small K U+1D55D𝕝Mathematical Double-Struck Small L U+1D55Eπ•žMathematical Double-Struck Small M U+1D55Fπ•ŸMathematical Double-Struck Small N U+1D560𝕠Mathematical Double-Struck Small O U+1D561𝕑Mathematical Double-Struck Small P