U+1D499 "𝒙" Mathematical Bold Italic Small X Unicode Character

U+1D499 "𝒙" Mathematical Bold Italic Small X is a typographic glyph designed for mathematical notation, specifically representing the lowercase letter "x" in a bold italic style. This character is part of the Mathematical Alphanumeric Symbols block, which was introduced to provide distinct, styled letterforms for unambiguous use in scientific and mathematical formulas, especially where a simple italic "x" might be confused with the multiplication sign or other variables. It is most commonly used in typesetting systems like LaTeX and on websites with proper font support to denote a vector, a variable in linear algebra, or an unknown quantity in complex equations, helping to clearly convey mathematical intent.

General Properties

Code Point	U+1D499
Version Added	3.1
Name	Mathematical Bold Italic Small X
Block	Mathematical Alphanumeric Symbols
General Category	Lowercase Letter
Canonical Combining Class	Not Reordered
Bidirectional Class	Left To Right
Decomposition Type	Font
Decomposition Mapping	"x" U+0078 Latin Small Letter X

Encodings

HTML Decimal Encoding	𝒙
HTML Hex Encoding	𝒙
UTF-8 Encoding	0xF0 0x9D 0x92 0x99
UTF-16 Encoding	0xD835 0xDC99
UTF-32 Encoding	0x0001D499
C/C++/Java Escape	\ud835\udc99

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	"x" U+0078 Latin Small Letter X
NFKC Simple Casefold	"x" U+0078 Latin Small Letter X
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