U+1D7DA "𝟚" Mathematical Double-Struck Digit Two Unicode Character

U+1D7DA "𝟚" Mathematical Double-Struck Digit Two is a styled numeric glyph belonging to the Mathematical Alphanumeric Symbols block, specifically designed for use in mathematical and scientific contexts where a bold or blackboard bold appearance is needed to distinguish the digit two from ordinary text. It is part of a complete set of double struck digits zero through nine, often employed in notation for sets of numbers, such as commonly representing the real numbers when used with a double struck capital ( R ), but serving here as a pure digit character. This character allows mathematicians and document authors to maintain consistent typographical conventions in typesetting systems like LaTeX or Unicode aware software.

General Properties

Code Point	U+1D7DA
Version Added	3.1
Name	Mathematical Double-Struck Digit Two
Block	Mathematical Alphanumeric Symbols
General Category	Decimal Number
Canonical Combining Class	Not Reordered
Bidirectional Class	European Number
Decomposition Type	Font
Decomposition Mapping	"2" U+0032 Digit Two

Encodings

HTML Decimal Encoding	𝟚
HTML Hex Encoding	𝟚
UTF-8 Encoding	0xF0 0x9D 0x9F 0x9A
UTF-16 Encoding	0xD835 0xDFDA
UTF-32 Encoding	0x0001D7DA
C/C++/Java Escape	\ud835\udfda

Unicode Properties

NFC Quick Check	Yes
NFD Quick Check	Yes
Numeric Type	Decimal
Numeric Value	2
Line Break	Numeric
Changes When NFKC Casefolded	Yes
NFKC Casefold	"2" U+0032 Digit Two
NFKC Simple Casefold	"2" U+0032 Digit Two
Script	Common
Script Extensions	Common
Indic Syllabic Category	Other
ID Continue	Yes
XID Continue	Yes
Math	Yes
Other Math	Yes
Vertical Orientation	Rotated
Grapheme Base	Yes
Grapheme Cluster Break	Other
Word Break	Numeric
Sentence Break	Numeric