U+1D664 "𝙤" Mathematical Sans-Serif Bold Italic Small O Unicode Character

U+1D664 "𝙤" Mathematical Sans-Serif Bold Italic Small O is a typographic glyph used primarily in mathematical and scientific notation to represent the lowercase letter "o" with a sans serif design that is both bold and italicized. This character is part of the Mathematical Alphanumeric Symbols block, which was encoded in Unicode to allow precise formatting in plain text where font-based styling is not available. It serves a specific purpose in academic contexts, such as denoting a variable or constant in equations, where the combination of sans serif weight and italic slope conveys meaning distinct from standard Roman or script typefaces.

General Properties

Code Point	U+1D664
Version Added	3.1
Name	Mathematical Sans-Serif Bold Italic Small O
Block	Mathematical Alphanumeric Symbols
General Category	Lowercase Letter
Canonical Combining Class	Not Reordered
Bidirectional Class	Left To Right
Decomposition Type	Font
Decomposition Mapping	"o" U+006F Latin Small Letter O

Encodings

HTML Decimal Encoding	𝙤
HTML Hex Encoding	𝙤
UTF-8 Encoding	0xF0 0x9D 0x99 0xA4
UTF-16 Encoding	0xD835 0xDE64
UTF-32 Encoding	0x0001D664
C/C++/Java Escape	\ud835\ude64

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	"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	Lower