U+1D574 "𝕴" Mathematical Bold Fraktur Capital I Unicode Character

Unicode Version 17.0

𝕴

U+1D574 "𝕴" Mathematical Bold Fraktur Capital I is a typographic symbol belonging to the Mathematical Alphanumeric Symbols block, designed for use in formal mathematical and scientific notation where bold Fraktur script is required to represent specific variables, sets, or algebraic structures. It combines the aesthetic of traditional blackletter or Fraktur calligraphy with a bold weight, making it distinct from standard Latin letters while maintaining a clear mathematical identity. This character is rarely used in everyday text but appears in advanced contexts such as abstract algebra, number theory, or logic to denote entities like ideals, rings, or other specialized constructs. Unlike standard Fraktur letters, its bold variant ensures visibility in complex formulas, and it is encoded for digital representation to avoid reliance on font styling alone, ensuring consistent rendering across platforms that support Unicode.

General Properties

Code Point U+1D574
Version Added 3.1
Name Mathematical Bold Fraktur Capital I
Block Mathematical Alphanumeric Symbols
General Category Uppercase Letter
Canonical Combining Class Not Reordered
Bidirectional Class Left To Right
Decomposition Type Font
Decomposition Mapping "I" U+0049 Latin Capital Letter I

Encodings

HTML Decimal Encoding 𝕴
HTML Hex Encoding 𝕴
UTF-8 Encoding 0xF0 0x9D 0x95 0xB4
UTF-16 Encoding 0xD835 0xDD74
UTF-32 Encoding 0x0001D574
C/C++/Java Escape \ud835\udd74

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 "i" U+0069 Latin Small Letter I
NFKC Simple Casefold "i" U+0069 Latin Small Letter I
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