U+1D659 "𝙙" Mathematical Sans-Serif Bold Italic Small D Unicode Character

U+1D659 "𝙙" Mathematical Sans-Serif Bold Italic Small D is a stylized typographic glyph intended for use in mathematical and scientific notation, where distinct letterforms are needed to denote variables, vectors, or named constants without ambiguity. This character is part of a large, dedicated block of mathematical alphanumeric symbols in the Unicode standard, allowing it to be rendered clearly in digital text regardless of the surrounding font. Its design combines a sans-serif typeface with bold weight and italic slant, specifically based on the lowercase letter d, making it visually distinct from both standard roman letters and serif italic forms.

General Properties

Code Point	U+1D659
Version Added	3.1
Name	Mathematical Sans-Serif Bold Italic Small D
Block	Mathematical Alphanumeric Symbols
General Category	Lowercase Letter
Canonical Combining Class	Not Reordered
Bidirectional Class	Left To Right
Decomposition Type	Font
Decomposition Mapping	"d" U+0064 Latin Small Letter D

Encodings

HTML Decimal Encoding	𝙙
HTML Hex Encoding	𝙙
UTF-8 Encoding	0xF0 0x9D 0x99 0x99
UTF-16 Encoding	0xD835 0xDE59
UTF-32 Encoding	0x0001D659
C/C++/Java Escape	\ud835\ude59

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	"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	Lower