U+1D42C "𝐬" Mathematical Bold Small S Unicode Character

U+1D42C "𝐬" Mathematical Bold Small S is a typographic character used primarily in mathematical notation to represent the letter S in a bold, upright style, distinguishing it from ordinary italicized variables. It belongs to the Mathematical Alphanumeric Symbols block, which provides distinct glyphs for use in equations and technical documents where formatting carries semantic meaning. This character is not intended for standard text but rather for precise mathematical expression, such as denoting a set, vector, or variable in proofs, textbooks, or scientific papers. Its inclusion in Unicode ensures consistent rendering across different platforms and fonts, supporting the needs of mathematicians and researchers who require clear, unambiguous symbols.

General Properties

Code Point	U+1D42C
Version Added	3.1
Name	Mathematical Bold Small S
Block	Mathematical Alphanumeric Symbols
General Category	Lowercase Letter
Canonical Combining Class	Not Reordered
Bidirectional Class	Left To Right
Decomposition Type	Font
Decomposition Mapping	"s" U+0073 Latin Small Letter S

Encodings

HTML Decimal Encoding	𝐬
HTML Hex Encoding	𝐬
UTF-8 Encoding	0xF0 0x9D 0x90 0xAC
UTF-16 Encoding	0xD835 0xDC2C
UTF-32 Encoding	0x0001D42C
C/C++/Java Escape	\ud835\udc2c

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	"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	Lower