U+1D43D "𝐽" Mathematical Italic Capital J Unicode Character

U+1D43D "𝐽" Mathematical Italic Capital J is a typographic variant of the Latin capital letter J, specifically designed for use in mathematical and scientific notation where italic styling distinguishes variables, constants, and functions from regular text. It belongs to the Mathematical Alphanumeric Symbols block, which was introduced to provide unambiguous, machine readable encoding for specialized mathematical formatting that would otherwise rely on simple text styling. This character allows authors to write an italic capital J in plain text environments such as web pages or academic documents, ensuring consistent rendering across different platforms and fonts without relying on markup or font specific characters.

General Properties

Code Point	U+1D43D
Version Added	3.1
Name	Mathematical Italic 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 0x90 0xBD
UTF-16 Encoding	0xD835 0xDC3D
UTF-32 Encoding	0x0001D43D
C/C++/Java Escape	\ud835\udc3d

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