U+1D442 "𝑂" Mathematical Italic Capital O Unicode Character

U+1D442 "𝑂" Mathematical Italic Capital O is a stylized letter O used primarily in mathematical and scientific notation to represent variables, constants, or other symbols in a distinct italic typeface that differs from the regular Latin alphabet. It is part of the Mathematical Alphanumeric Symbols block, which provides standardized glyphs to ensure clear distinction between text and mathematical expressions, such as in equations where italic capital O might denote a specific set or function like big-O notation. This character helps avoid ambiguity with the ordinary uppercase O and supports precise typesetting in digital documents and academic publishing.

General Properties

Code Point	U+1D442
Version Added	3.1
Name	Mathematical Italic Capital O
Block	Mathematical Alphanumeric Symbols
General Category	Uppercase Letter
Canonical Combining Class	Not Reordered
Bidirectional Class	Left To Right
Decomposition Type	Font
Decomposition Mapping	"O" U+004F Latin Capital Letter O

Encodings

HTML Decimal Encoding	𝑂
HTML Hex Encoding	𝑂
UTF-8 Encoding	0xF0 0x9D 0x91 0x82
UTF-16 Encoding	0xD835 0xDC42
UTF-32 Encoding	0x0001D442
C/C++/Java Escape	\ud835\udc42

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	"o" U+006F Latin Small Letter O
NFKC Simple Casefold	"o" U+006F Latin Small Letter O
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