U+1D644 "𝙄" Mathematical Sans-Serif Bold Italic Capital I Unicode Character

U+1D644 "𝙄" Mathematical Sans-Serif Bold Italic Capital I is part of the Mathematical Alphanumeric Symbols block, designed for use in scientific and mathematical notation to represent variables, constants, or matrices with a distinct, non-serif style. This character allows authors to clearly differentiate mathematical expressions from surrounding plain text, particularly when a bold, italic, sans-serif appearance is needed for typographic consistency. It is encoded in the Supplementary Multilingual Plane and is not intended for general textual use, but specifically for mathematical formatting in contexts like digital documents, academic papers, or equations.

General Properties

Code Point	U+1D644
Version Added	3.1
Name	Mathematical Sans-Serif Bold Italic Capital I
Block	Mathematical Alphanumeric Symbols
General Category	Uppercase Letter
Canonical Combining Class	Not Reordered
Bidirectional Class	Left To Right
Decomposition Type	Font
Decomposition Mapping	"I" U+0049 Latin Capital Letter I

Encodings

HTML Decimal Encoding	𝙄
HTML Hex Encoding	𝙄
UTF-8 Encoding	0xF0 0x9D 0x99 0x84
UTF-16 Encoding	0xD835 0xDE44
UTF-32 Encoding	0x0001D644
C/C++/Java Escape	\ud835\ude44

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	"i" U+0069 Latin Small Letter I
NFKC Simple Casefold	"i" U+0069 Latin Small Letter I
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