U+1D6BD "𝚽" Mathematical Bold Capital Phi Unicode Character

U+1D6BD "𝚽" Mathematical Bold Capital Phi is a typographic variant of the Greek capital letter Phi, designed for use in mathematical and scientific notation where a bold typeface is required to emphasize variables, constants, or matrix symbols. It belongs to the Mathematical Alphanumeric Symbols block, which was added to Unicode to allow mathematicians and scientists to represent distinct letter styles without relying on formatting that could be lost in plain text. This specific glyph is often used to denote the golden ratio, a magnetic flux angle, or the cumulative distribution function in statistics, and it appears visually heavier than its standard Greek counterpart to convey structural importance in equations.

General Properties

Code Point	U+1D6BD
Version Added	3.1
Name	Mathematical Bold 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 0x9A 0xBD
UTF-16 Encoding	0xD835 0xDEBD
UTF-32 Encoding	0x0001D6BD
C/C++/Java Escape	\ud835\udebd

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