U+1D403 "𝐃" Mathematical Bold Capital D Unicode Character

U+1D403 "𝐃" Mathematical Bold Capital D is a character in the Mathematical Alphanumeric Symbols block, designed for use in mathematical and scientific notation where a bold, uppercase letter D is required to distinguish it from standard text. It is part of a larger set of Unicode characters that replicate the Latin alphabet in various styles, such as bold, italic, or script, to represent variables, vectors, or matrices in formal equations. This character is not intended for general writing but serves a specialized purpose in digital typesetting, allowing mathematicians and researchers to express bold formatting unambiguously in plain text environments, such as in markup languages or code, without relying on font styling.

General Properties

Code Point	U+1D403
Version Added	3.1
Name	Mathematical Bold Capital D
Block	Mathematical Alphanumeric Symbols
General Category	Uppercase Letter
Canonical Combining Class	Not Reordered
Bidirectional Class	Left To Right
Decomposition Type	Font
Decomposition Mapping	"D" U+0044 Latin Capital Letter D

Encodings

HTML Decimal Encoding	𝐃
HTML Hex Encoding	𝐃
UTF-8 Encoding	0xF0 0x9D 0x90 0x83
UTF-16 Encoding	0xD835 0xDC03
UTF-32 Encoding	0x0001D403
C/C++/Java Escape	\ud835\udc03

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	"d" U+0064 Latin Small Letter D
NFKC Simple Casefold	"d" U+0064 Latin Small Letter D
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