U+1D584 "𝖄" Mathematical Bold Fraktur Capital Y Unicode Character

U+1D584 "𝖄" Mathematical Bold Fraktur Capital Y is a visually distinct glyph used primarily in mathematical and academic typesetting to represent a bold Fraktur capital Y, combining the heavy, decorative strokes of the Fraktur script with a bold weight to stand out in formulas, theorems, or scholarly works. It belongs to the Mathematical Alphanumeric Symbols block, which provides specialized letter forms to avoid ambiguity when multiple variables or symbols are needed in complex notation. This character is rarely employed in everyday text but serves a specific function in disciplines like mathematics, logic, or philosophy, where traditional Fraktur letters are sometimes used for sets, transformations, or conceptual entities.

General Properties

Code Point	U+1D584
Version Added	3.1
Name	Mathematical Bold Fraktur Capital Y
Block	Mathematical Alphanumeric Symbols
General Category	Uppercase Letter
Canonical Combining Class	Not Reordered
Bidirectional Class	Left To Right
Decomposition Type	Font
Decomposition Mapping	"Y" U+0059 Latin Capital Letter Y

Encodings

HTML Decimal Encoding	𝖄
HTML Hex Encoding	𝖄
UTF-8 Encoding	0xF0 0x9D 0x96 0x84
UTF-16 Encoding	0xD835 0xDD84
UTF-32 Encoding	0x0001D584
C/C++/Java Escape	\ud835\udd84

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	"y" U+0079 Latin Small Letter Y
NFKC Simple Casefold	"y" U+0079 Latin Small Letter Y
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