U+03A6 "Φ" Greek Capital Letter Phi Unicode Character

U+03A6 "Φ" Greek Capital Letter Phi is the twenty first letter of the Greek alphabet, historically representing an aspirated /pʰ/ sound in Ancient Greek and evolving to represent the voiceless labiodental fricative /f/ in Modern Greek. In mathematics, science, and engineering, it is famously used as a symbol for the golden ratio (approximately 1.618) and often denotes a phase angle, magnetic flux, or the empty set in certain contexts. Additionally, phi is commonly employed as a variable in geometry, physics, and philosophy, where it can represent a general angle or a fundamental constant, while its uppercase form is distinct from the lowercase φ in typography and Unicode encoding.

General Properties

Code Point	U+03A6
Version Added	1.1
Name	Greek Capital Letter Phi
Block	Greek and Coptic
General Category	Uppercase Letter
Canonical Combining Class	Not Reordered
Bidirectional Class	Left To Right

Encodings

HTML Decimal Encoding	Φ
HTML Hex Encoding	Φ
UTF-8 Encoding	0xCE 0xA6
UTF-16 Encoding	0x03A6
UTF-32 Encoding	0x000003A6
C/C++/Java Escape	\u03a6

Unicode Properties

NFC Quick Check	Yes
NFD Quick Check	Yes
NFKC Quick Check	Yes
NFKD Quick Check	Yes
Numeric Type	None
Numeric Value	NaN
Line Break	Alphabetic
East Asian Width	Ambiguous
Uppercase	Yes
Simple Lowercase Code Point	"φ" U+03C6 Greek Small Letter Phi
Lowercase Code Point	"φ" U+03C6 Greek Small Letter Phi
Simple Case Folding	"φ" U+03C6 Greek Small Letter Phi
Case Folding	"φ" U+03C6 Greek Small Letter Phi
Cased	Yes
Changes When Casefolded	Yes
Changes When Casemapped	Yes
Changes When Lowercased	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	Greek
Script Extensions	Greek
Indic Syllabic Category	Other
ID Start	Yes
XID Start	Yes
ID Continue	Yes
XID Continue	Yes
Alphabetic	Yes
Vertical Orientation	Rotated
Grapheme Base	Yes
Grapheme Cluster Break	Other
Word Break	Alphabetic letter
Sentence Break	Upper