U+1D560 "𝕠" Mathematical Double-Struck Small O Unicode Character

U+1D560 "𝕠" Mathematical Double-Struck Small O is a stylized letterform used primarily in mathematical and academic contexts to denote the set of ordinal numbers or, more rarely, a specific vector or variable in higher algebra, as part of the double‑struck typeface family which mimics blackboard bold writing. This character belongs to the Mathematical Alphanumeric Symbols block, encoded specifically for distinction from ordinary letters to prevent ambiguity in complex formulas. It functions as a precise, typographically standardized symbol within the Unicode standard, ensuring consistent representation across digital platforms for advanced mathematical notation.

General Properties

Code Point	U+1D560
Version Added	3.1
Name	Mathematical Double-Struck 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 0x95 0xA0
UTF-16 Encoding	0xD835 0xDD60
UTF-32 Encoding	0x0001D560
C/C++/Java Escape	\ud835\udd60

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