U+1D66D "𝙭" Mathematical Sans-Serif Bold Italic Small X Unicode Character

U+1D66D "𝙭" Mathematical Sans-Serif Bold Italic Small X is a typographic variant of the Latin letter "x" designed for use in mathematical and scientific notation, where it provides a distinct, slanted, and thickened glyph that helps differentiate variables from standard text. It belongs to the Mathematical Alphanumeric Symbols block, which was added to Unicode to allow unambiguous representation of styled letters in plain text, avoiding the need for font-based formatting that can break during data transfer or processing. This specific character is often employed in formulas, proofs, and technical documents to denote a variable or unknown quantity with a clean, modern sans-serif appearance that maintains readability and semantic clarity.

General Properties

Code Point	U+1D66D
Version Added	3.1
Name	Mathematical Sans-Serif 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 0x99 0xAD
UTF-16 Encoding	0xD835 0xDE6D
UTF-32 Encoding	0x0001D66D
C/C++/Java Escape	\ud835\ude6d

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