U+1D781 "𝞁" Mathematical Sans-Serif Bold Small Final Sigma Unicode Character

U+1D781 "𝞁" Mathematical Sans-Serif Bold Small Final Sigma is a typographic glyph belonging to the Mathematical Alphanumeric Symbols block, designed for use in mathematical notation where a bold, sans-serif variant of the Greek final sigma (used at the end of a word) is needed. This character allows authors and typesetters to distinguish mathematical variables from regular text, particularly in fields such as physics or algebra where different styles convey specific semantic roles. It is encoded separately from the standard Greek final sigma (U+03C2) to preserve font and style distinctions in plain text environments that support Unicode.

General Properties

Code Point	U+1D781
Version Added	3.1
Name	Mathematical Sans-Serif Bold Small Final Sigma
Block	Mathematical Alphanumeric Symbols
General Category	Lowercase Letter
Canonical Combining Class	Not Reordered
Bidirectional Class	Left To Right
Decomposition Type	Font
Decomposition Mapping	"ς" U+03C2 Greek Small Letter Final Sigma

Encodings

HTML Decimal Encoding	𝞁
HTML Hex Encoding	𝞁
UTF-8 Encoding	0xF0 0x9D 0x9E 0x81
UTF-16 Encoding	0xD835 0xDF81
UTF-32 Encoding	0x0001D781
C/C++/Java Escape	\ud835\udf81

Unicode Properties

NFC Quick Check	Yes
NFD Quick Check	Yes
Numeric Type	None
Numeric Value	NaN
Line Break	Alphabetic
Lowercase	Yes
Cased	Yes
Changes When NFKC Casefolded	Yes
NFKC Casefold	"σ" U+03C3 Greek Small Letter Sigma
NFKC Simple Casefold	"σ" U+03C3 Greek Small Letter Sigma
Script	Common
Script Extensions	Common
Indic Syllabic Category	Other
ID Start	Yes
XID Start	Yes
ID Continue	Yes
XID Continue	Yes
Alphabetic	Yes
Math	Yes
Other Math	Yes
Vertical Orientation	Rotated
Grapheme Base	Yes
Grapheme Cluster Break	Other
Word Break	Alphabetic letter
Sentence Break	Lower