What is the HTML code for 𝕽?

Use 𝕽 (decimal) or 𝕽 (hex).

What is the UTF-8 encoding of U+1D57D?

F0 9D 95 BD (hex), 4 bytes. In a URL it is %F0%9D%95%BD.

How do I write U+1D57D in JavaScript or Python?

JavaScript: \u{1D57D} or \uD835\uDD7D. Python: \U0001D57D.

𝕽 Mathematical Bold Fraktur Capital R: copy and paste

𝕽 Mathematical Bold Fraktur Capital R

Uppercase letter. Codes for HTML, CSS, JavaScript, Python and other languages.

𝕽

𝕽 is the Unicode character MATHEMATICAL BOLD FRAKTUR CAPITAL R, code point U+1D57D (decimal 120189) in the Mathematical Alphanumeric Symbols block, added in Unicode 3.1. In HTML write 𝕽, and in UTF-8 it is the 4 bytes F0 9D 95 BD.

Codes

Where	How to write it
Code point	U+1D57D
Decimal	120189
UTF-8 bytes	F0 9D 95 BD
UTF-16 (big-endian)	D835 DD7D
UTF-32	0001D57D
HTML decimal	𝕽
HTML hex	𝕽
CSS	\1D57D
JavaScript	\u{1D57D} or \uD835\uDD7D
JSON	\uD835\uDD7D
Python	\U0001D57D
Python by name	\N{MATHEMATICAL BOLD FRAKTUR CAPITAL R}
Java, C#	\uD835\uDD7D
Rust, Swift	\u{1D57D}
Go, C, C++	\U0001D57D
URL (percent-encoded)	%F0%9D%95%BD

JavaScript and JSON strings store text as UTF-16, so this character takes two code units (a surrogate pair) and "𝕽".length is 2. Python 3 strings count code points, so its length there is 1.

Properties

Property	Value
Name	MATHEMATICAL BOLD FRAKTUR CAPITAL R
Code point	U+1D57D (decimal 120189)
Block	Mathematical Alphanumeric Symbols (U+1D400–U+1D7FF)
General category	Lu: Uppercase letter
Script	Common
Bidirectional class	L: Left-to-right
Mirrored in right-to-left text	No
First in Unicode version	3.1

Decomposition

MATHEMATICAL BOLD FRAKTUR CAPITAL R has a compatibility decomposition (font) to the sequence below. NFKC and NFKD normalisation replace it with that sequence, which can change how text looks, so use them for search, not for storage.

R U+0052 Latin Capital Letter R

Nearby in Mathematical Alphanumeric Symbols

All 997 characters: Mathematical Alphanumeric Symbols.

Official reference

Unicode code chart: Mathematical Alphanumeric Symbols (PDF, unicode.org)

Questions people ask

What is the HTML code for 𝕽?: Use 𝕽 (decimal) or 𝕽 (hex).
What is the UTF-8 encoding of U+1D57D?: F0 9D 95 BD (hex), 4 bytes. In a URL it is %F0%9D%95%BD.
How do I write U+1D57D in JavaScript or Python?: JavaScript: \u{1D57D} or \uD835\uDD7D. Python: \U0001D57D.

Source

Unicode Character Database 18.0.0 (Unicode License v3); HTML entity names from the WHATWG HTML Standard (CC BY 4.0). The encodings above are computed from the code point and checked against Python's encoders. How the character looks depends on your fonts.

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