U+1D4D9 "𝓙" Mathematical Bold Script Capital J Unicode Character

U+1D4D9 "𝓙" Mathematical Bold Script Capital J is a stylized, decorative letterform from the "Mathematical Alphanumeric Symbols" block, designed for use in mathematical notation to represent a variable, function, or set with a bold and script-like visual emphasis. It combines the aesthetic of a cursive or calligraphic capital J with a bold typeface weight, distinguishing it from standard alphabetical characters to avoid confusion with ordinary text. This character is intended for scientific and academic contexts where specific formatting is required, such as in equations or formal papers, and it is not typically used for general prose or everyday writing.

General Properties

Code Point	U+1D4D9
Version Added	3.1
Name	Mathematical Bold Script Capital J
Block	Mathematical Alphanumeric Symbols
General Category	Uppercase Letter
Canonical Combining Class	Not Reordered
Bidirectional Class	Left To Right
Decomposition Type	Font
Decomposition Mapping	"J" U+004A Latin Capital Letter J

Encodings

HTML Decimal Encoding	𝓙
HTML Hex Encoding	𝓙
UTF-8 Encoding	0xF0 0x9D 0x93 0x99
UTF-16 Encoding	0xD835 0xDCD9
UTF-32 Encoding	0x0001D4D9
C/C++/Java Escape	\ud835\udcd9

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	"j" U+006A Latin Small Letter J
NFKC Simple Casefold	"j" U+006A Latin Small Letter J
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