U+1D54A "𝕊" Mathematical Double-Struck Capital S Unicode Character

U+1D54A "𝕊" Mathematical Double-Struck Capital S is part of the Mathematical Alphanumeric Symbols block, designed for use in mathematical and scientific notation where a bold, blackboard style letter is needed. This stylized capital S, often associated with the blackboard bold typeface originally used in blackboard writing to denote specialized number sets, is commonly employed to represent the set of all Schur functions, the sphere spectrum in homotopy theory, or the group of units in a ring. It belongs to a range of Unicode characters that provide distinct letterforms for technical fields, ensuring clear differentiation between ordinary text and mathematical symbols in digital documents.

General Properties

Code Point	U+1D54A
Version Added	3.1
Name	Mathematical Double-Struck Capital S
Block	Mathematical Alphanumeric Symbols
General Category	Uppercase Letter
Canonical Combining Class	Not Reordered
Bidirectional Class	Left To Right
Decomposition Type	Font
Decomposition Mapping	"S" U+0053 Latin Capital Letter S

Encodings

HTML Decimal Encoding	𝕊
HTML Hex Encoding	𝕊
UTF-8 Encoding	0xF0 0x9D 0x95 0x8A
UTF-16 Encoding	0xD835 0xDD4A
UTF-32 Encoding	0x0001D54A
C/C++/Java Escape	\ud835\udd4a

Unicode Properties

NFC Quick Check	Yes
NFD Quick Check	Yes
Numeric Type	None
Numeric Value	NaN
Line Break	Alphabetic
Uppercase	Yes
Cased	Yes
Changes When NFKC Casefolded	Yes
NFKC Casefold	"s" U+0073 Latin Small Letter S
NFKC Simple Casefold	"s" U+0073 Latin Small Letter S
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	Upper