Phi (Φ, φ) Definition | Math Converse
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WEBPhi (Φ, φ) is the 21st letter of the Greek alphabet. In the system of traditional Greek numerals, phi has a value of 500 (φʹ) or 500,000 (͵φ). In Archaic and Classical Greek (c. 9th century BC to 4th century BC), it represented an aspirated voiceless bilabial plosive ( [p h ]), which was the origin of its usual romanization as ph .
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