U+1D57D "𝕽" Mathematical Bold Fraktur Capital R Unicode Character

U+1D57D "𝕽" Mathematical Bold Fraktur Capital R is a stylized letterform from the Mathematical Alphanumeric Symbols block, intended for use in mathematical and scientific notation to distinguish variables, sets, or special functions from ordinary text. Its design combines the heavy, angular strokes of Fraktur script with a bold weight, giving it a formal and decorative appearance reminiscent of medieval manuscripts. In practice, this character is often employed to represent the real numbers in set theory, the ring of real numbers in algebra, or as a symbol for other mathematical entities where a distinctive, blackletter-style capital R is needed.

General Properties

Code Point	U+1D57D
Version Added	3.1
Name	Mathematical Bold Fraktur Capital R
Block	Mathematical Alphanumeric Symbols
General Category	Uppercase Letter
Canonical Combining Class	Not Reordered
Bidirectional Class	Left To Right
Decomposition Type	Font
Decomposition Mapping	"R" U+0052 Latin Capital Letter R

Encodings

HTML Decimal Encoding	𝕽
HTML Hex Encoding	𝕽
UTF-8 Encoding	0xF0 0x9D 0x95 0xBD
UTF-16 Encoding	0xD835 0xDD7D
UTF-32 Encoding	0x0001D57D
C/C++/Java Escape	\ud835\udd7d

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	"r" U+0072 Latin Small Letter R
NFKC Simple Casefold	"r" U+0072 Latin Small Letter R
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