U+1D729 "𝜩" Mathematical Bold Italic Capital Xi Unicode Character

Unicode Version 17.0

𝜩

U+1D729 "𝜩" Mathematical Bold Italic Capital Xi is a typographic variant of the uppercase Greek letter Xi (Ξ) that combines a bold weight with an italic slant, rendering it distinct from standard Greek text. This character belongs to the Mathematical Alphanumeric Symbols block, which was added to Unicode to facilitate clear and specific notation in scientific, technical, and mathematical documents where different letter styles convey different meanings. As a result, "𝜩" is typically used in mathematical equations and theoretical contexts to represent a specialized variable, constant, or operator, ensuring that its bold italic form signals a distinct role compared to ordinary text or other typographic variants like plain, bold, or italic alone.

General Properties

Code Point U+1D729
Version Added 3.1
Name Mathematical Bold Italic Capital Xi
Block Mathematical Alphanumeric Symbols
General Category Uppercase Letter
Canonical Combining Class Not Reordered
Bidirectional Class Left To Right
Decomposition Type Font
Decomposition Mapping "Ξ" U+039E Greek Capital Letter Xi

Encodings

HTML Decimal Encoding 𝜩
HTML Hex Encoding 𝜩
UTF-8 Encoding 0xF0 0x9D 0x9C 0xA9
UTF-16 Encoding 0xD835 0xDF29
UTF-32 Encoding 0x0001D729
C/C++/Java Escape \ud835\udf29

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 "ξ" U+03BE Greek Small Letter Xi
NFKC Simple Casefold "ξ" U+03BE Greek Small Letter Xi
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