U+1D409 "𝐉" Mathematical Bold Capital J Unicode Character

U+1D409 "𝐉" Mathematical Bold Capital J is a typographic variant of the standard Latin letter J, designed specifically for use in mathematical and scientific notation where a bold style is required to denote vectors, matrices, or other special mathematical objects. It belongs to the Mathematical Alphanumeric Symbols block, which provides distinct styles of letters and digits to avoid confusion with ordinary text, allowing formulas to be rendered accurately in digital environments. This character complements other bold letters in its set, ensuring consistent formatting for algebraic expressions and technical documents without relying on font-based styling that may fail to transfer across different platforms.

General Properties

Code Point	U+1D409
Version Added	3.1
Name	Mathematical Bold 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 0x89
UTF-16 Encoding	0xD835 0xDC09
UTF-32 Encoding	0x0001D409
C/C++/Java Escape	\ud835\udc09

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