U+1D731 "𝜱" Mathematical Bold Italic Capital Phi Unicode Character

U+1D731 "𝜱" Mathematical Bold Italic Capital Phi is a stylized glyph representing the Greek letter Phi in a bold italic typeface, primarily used in mathematical and scientific notation to denote variables, functions, or constants such as the golden ratio or magnetic flux. It is part of the Mathematical Alphanumeric Symbols block, which provides distinct typographic variants of Latin and Greek letters to prevent confusion with ordinary text in complex equations. This character is typically rendered in specialized fonts like Cambria Math or Latin Modern Math and is essential for clear semantic communication in fields like physics, engineering, and advanced mathematics.

General Properties

Code Point	U+1D731
Version Added	3.1
Name	Mathematical Bold Italic Capital Phi
Block	Mathematical Alphanumeric Symbols
General Category	Uppercase Letter
Canonical Combining Class	Not Reordered
Bidirectional Class	Left To Right
Decomposition Type	Font
Decomposition Mapping	"Φ" U+03A6 Greek Capital Letter Phi

Encodings

HTML Decimal Encoding	𝜱
HTML Hex Encoding	𝜱
UTF-8 Encoding	0xF0 0x9D 0x9C 0xB1
UTF-16 Encoding	0xD835 0xDF31
UTF-32 Encoding	0x0001D731
C/C++/Java Escape	\ud835\udf31

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	"φ" U+03C6 Greek Small Letter Phi
NFKC Simple Casefold	"φ" U+03C6 Greek Small Letter Phi
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