U+1D6D4 "𝛔" Mathematical Bold Small Sigma Unicode Character

U+1D6D4 "𝛔" Mathematical Bold Small Sigma is a typographical variant of the Greek letter sigma, specifically designed for use in mathematical and scientific notation to represent a summation symbol or a statistical standard deviation in a bold typeface. This character belongs to the "Mathematical Alphanumeric Symbols" block, which allows authors to clearly differentiate between ordinary Greek letters and their mathematical counterparts, particularly in contexts where formatting like bold is not easily applied through regular styling. Its purpose is to provide a distinct, unambiguous glyph for equations, ensuring that the bold sigma stands out visually from standard text to denote a specific mathematical meaning or emphasis.

General Properties

Code Point	U+1D6D4
Version Added	3.1
Name	Mathematical Bold Small 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+03C3 Greek Small Letter Sigma

Encodings

HTML Decimal Encoding	𝛔
HTML Hex Encoding	𝛔
UTF-8 Encoding	0xF0 0x9D 0x9B 0x94
UTF-16 Encoding	0xD835 0xDED4
UTF-32 Encoding	0x0001D6D4
C/C++/Java Escape	\ud835\uded4

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