UnicodeCharactercom
𝕗
U+1D557 Β· MATHEMATICAL DOUBLE-STRUCK SMALL F

Mathematical Double-Struck Small F

  • CodepointU+1D557
  • NameMATHEMATICAL DOUBLE-STRUCK SMALL F
  • Decimal120151
  • 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+1D557 (𝕗) is MATHEMATICAL DOUBLE-STRUCK SMALL F, 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+0066 f (compatibility decomposition <font>). NFC and NFD leave it alone, but NFKC and NFKD replace it with U+0066 f. Search engines, identifier checks and username systems that apply NFKC will treat the two as the same text.

How to type 𝕗

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Encodings & escapes

UTF-8 encoder β†’
UTF-8F0 9D 95 974 bytes
UTF-16D835 DD57surrogate pair
UTF-320001D5574 bytes
HTML named&fopf;named character reference
HTML decimal&#120151;
HTML hex&#x1D557;
CSS\1D557in content: "…"
JavaScript\u{1D557}ES2015+
JavaScript\uD835\uDD57surrogate pair
JSON\uD835\uDD57
Python\U0001D557
Python\N{MATHEMATICAL DOUBLE-STRUCK SMALL F}by name
Java / C#\uD835\uDD57
C / C++\U0001D557universal character name
Rust / Swift / PHP\u{1D557}
Go\U0001D557
Ruby\u{1D557}
Excel / Sheets=UNICHAR(120151)
URL-encoded%F0%9D%95%97percent-encoded UTF-8
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Normalization forms

Normalizer β†’
NFCunchanged
NFDunchanged
NFKCU+0066 f
NFKDU+0066 f
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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+0066fLatin Small Letter F U+017FΕΏLatin Small Letter Long S U+0584Φ„Armenian Small Letter Keh U+1E9DẝLatin Small Letter Long S with High Stroke U+1D41F𝐟Mathematical Bold Small F U+1D453𝑓Mathematical Italic Small F U+1D487𝒇Mathematical Bold Italic Small F U+1D4BB𝒻Mathematical Script Small F U+1D4EF𝓯Mathematical Bold Script Small F U+1D523𝔣Mathematical Fraktur Small F U+1D58B𝖋Mathematical Bold Fraktur Small F U+1D5BF𝖿Mathematical Sans-Serif Small F U+1D5F3𝗳Mathematical Sans-Serif Bold Small F U+1D627𝘧Mathematical Sans-Serif Italic Small F U+1D65B𝙛Mathematical Sans-Serif Bold Italic Small F U+1D68F𝚏Mathematical Monospace Small F
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Nearby in Mathematical Alphanumeric Symbols

All in block β†’
U+1D552𝕒Mathematical Double-Struck Small A U+1D553𝕓Mathematical Double-Struck Small B U+1D554𝕔Mathematical Double-Struck Small C U+1D555𝕕Mathematical Double-Struck Small D U+1D556𝕖Mathematical Double-Struck Small E U+1D558π•˜Mathematical Double-Struck Small G U+1D559𝕙Mathematical Double-Struck Small H U+1D55Aπ•šMathematical Double-Struck Small I U+1D55B𝕛Mathematical Double-Struck Small J U+1D55Cπ•œMathematical Double-Struck Small K U+1D55D𝕝Mathematical Double-Struck Small L