U+1D678 "𝙸" Mathematical Monospace Capital I Unicode Character

U+1D678 "𝙸" Mathematical Monospace Capital I is a stylized letter from the Mathematical Alphanumeric Symbols block, designed to emulate the fixed-width appearance of a typewriter or computer monospace font for the uppercase "I". This character belongs to a set of mathematical symbols used to clearly distinguish variables, constants, or named entities in technical and scientific notation, especially when standard uppercase letters might be confused with other symbols or lack the desired formatting. While it visually mimics a monospace "I", it serves a purely semantic role in digital text, allowing authors to denote an identity matrix, a set, or other mathematical objects without relying on font styling or markup.

General Properties

Code Point	U+1D678
Version Added	3.1
Name	Mathematical Monospace 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 0xB8
UTF-16 Encoding	0xD835 0xDE78
UTF-32 Encoding	0x0001D678
C/C++/Java Escape	\ud835\ude78

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