U+03C6 "φ" Greek Small Letter Phi Unicode Character

U+03C6 "φ" Greek Small Letter Phi is the twenty first letter of the Greek alphabet, representing an aspirated voiceless bilabial or labiodental fricative sound in Ancient Greek and a voiceless labiodental fricative in Modern Greek. In mathematics and science, it is widely used as a symbol for the golden ratio (approximately 1.618), the Euler totient function in number theory, and magnetic flux in physics, as well as representing a phase angle in engineering and a null set in set theory. Its visual form typically resembles a circle with a vertical line through it, though a cursive variant (ϕ) is also common in technical contexts.

General Properties

Code Point	U+03C6
Version Added	1.1
Name	Greek Small Letter Phi
Block	Greek and Coptic
General Category	Lowercase Letter
Canonical Combining Class	Not Reordered
Bidirectional Class	Left To Right

Encodings

HTML Decimal Encoding	φ
HTML Hex Encoding	φ
UTF-8 Encoding	0xCF 0x86
UTF-16 Encoding	0x03C6
UTF-32 Encoding	0x000003C6
C/C++/Java Escape	\u03c6

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
Lowercase	Yes
Simple Uppercase Code Point	"Φ" U+03A6 Greek Capital Letter Phi
Simple Titlecase Code Point	"Φ" U+03A6 Greek Capital Letter Phi
Uppercase Code Point	"Φ" U+03A6 Greek Capital Letter Phi
Titlecase Code Point	"Φ" U+03A6 Greek Capital Letter Phi
Cased	Yes
Changes When Casemapped	Yes
Changes When Titlecased	Yes
Changes When Uppercased	Yes
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	Lower