U+1D521 "𝔡" Mathematical Fraktur Small D Unicode Character

U+1D521 "𝔡" Mathematical Fraktur Small D is a typographic glyph from the Mathematical Alphanumeric Symbols block, designed for use in mathematical and scientific notation to represent the variable "d" in a distinct Fraktur style. This stylized letterform, which resembles a medieval blackletter script, is specifically intended to differentiate semantic variables or constants from ordinary text in complex equations, such as in calculus where it might denote a differential operator or in set theory for representing a specific set. Its inclusion in Unicode ensures that the character can be reliably rendered across digital platforms, preserving the precise formatting required in academic and technical documents.

General Properties

Code Point	U+1D521
Version Added	3.1
Name	Mathematical Fraktur 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 0x94 0xA1
UTF-16 Encoding	0xD835 0xDD21
UTF-32 Encoding	0x0001D521
C/C++/Java Escape	\ud835\udd21

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