What is the HTML code for 𝞁?

Use 𝞁 (decimal) or 𝞁 (hex).

What is the UTF-8 encoding of U+1D781?

F0 9D 9E 81 (hex), 4 bytes. In a URL it is %F0%9D%9E%81.

How do I write U+1D781 in JavaScript or Python?

JavaScript: \u{1D781} or \uD835\uDF81. Python: \U0001D781.

𝞁 Mathematical Sans-Serif Bold Small Final Sigma

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

𝞁

𝞁 is the Unicode character MATHEMATICAL SANS-SERIF BOLD SMALL FINAL SIGMA, code point U+1D781 (decimal 120705) in the Mathematical Alphanumeric Symbols block, added in Unicode 3.1. In HTML write 𝞁, and in UTF-8 it is the 4 bytes F0 9D 9E 81.

Codes

Where	How to write it
Code point	U+1D781
Decimal	120705
UTF-8 bytes	F0 9D 9E 81
UTF-16 (big-endian)	D835 DF81
UTF-32	0001D781
HTML decimal	𝞁
HTML hex	𝞁
CSS	\1D781
JavaScript	\u{1D781} or \uD835\uDF81
JSON	\uD835\uDF81
Python	\U0001D781
Python by name	\N{MATHEMATICAL SANS-SERIF BOLD SMALL FINAL SIGMA}
Java, C#	\uD835\uDF81
Rust, Swift	\u{1D781}
Go, C, C++	\U0001D781
URL (percent-encoded)	%F0%9D%9E%81

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

Properties

Property	Value
Name	MATHEMATICAL SANS-SERIF BOLD SMALL FINAL SIGMA
Code point	U+1D781 (decimal 120705)
Block	Mathematical Alphanumeric Symbols (U+1D400–U+1D7FF)
General category	Ll: Lowercase letter
Script	Common
Bidirectional class	L: Left-to-right
Mirrored in right-to-left text	No
First in Unicode version	3.1

Decomposition

MATHEMATICAL SANS-SERIF BOLD SMALL FINAL SIGMA 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.

ς U+03C2 Greek Small Letter Final Sigma

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 𝞁?: Use 𝞁 (decimal) or 𝞁 (hex).
What is the UTF-8 encoding of U+1D781?: F0 9D 9E 81 (hex), 4 bytes. In a URL it is %F0%9D%9E%81.
How do I write U+1D781 in JavaScript or Python?: JavaScript: \u{1D781} or \uD835\uDF81. Python: \U0001D781.

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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