U+1D639 "𝘹" Mathematical Sans-Serif Italic Small X Unicode Character

U+1D639 "𝘹" Mathematical Sans-Serif Italic Small X is a typographic glyph belonging to the Mathematical Alphanumeric Symbols block, designed for use in scientific and mathematical notation where a sans-serif italic style is required. It represents a lowercase Latin 'x' in a clean, slanted font without serifs, distinguishing it from standard italic or serif variants for clarity in formulas, variables, or symbolic expressions. This character allows authors and typesetting systems to precisely specify the appearance of mathematical text, ensuring consistent representation across digital platforms and avoiding ambiguity in complex equations or technical documents.

General Properties

Code Point	U+1D639
Version Added	3.1
Name	Mathematical Sans-Serif 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 0x98 0xB9
UTF-16 Encoding	0xD835 0xDE39
UTF-32 Encoding	0x0001D639
C/C++/Java Escape	\ud835\ude39

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