Phi (/ faɪ / ⓘ; [1] uppercase Φ, lowercase φ or ϕ; Ancient Greek: ϕεῖ pheî [pʰéî̯]; Modern Greek: φι fi [fi]) is the twenty-first letter of the Greek alphabet. In Archaic and Classical Greek (c. 9th to 4th century BC), it represented an aspirated voiceless bilabial plosive ([pʰ]), which was the origin of its usual romanization as ph .

Phi (uppercase/lowercase Φ φ), is the 21st letter of the Greek alphabet, used to represent the "ph" sound in Ancient Greek. This sound changed to "f" some time in the 1st century AD, and in Modern Greek the letter denotes the "f" sound.

Greek alphabet letters and symbols. Greek letters pronunciation.

Phi is the 21st letter of the Greek alphabet. It is used in various contexts, including mathematics, science, and engineering, where it often represents the golden ratio (φ). Uppercase Phi - Φ; Lowercase Phi - φ

The phi symbol (Φ φ) is the 21st letter of the Greek alphabet. Learn its meaning, see uppercase 'Φ' and lowercase 'φ' forms, and easily copy and paste the symbol for your use.

Phi (uppercase Φ, lowercase φ) is the 21st letter of the Modern Greek alphabet. In the Greek number system, it was taken as the symbol of 500. In math, the lowercase letter phi (φ) is used to indicate the golden ratio.

Phi (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).

Dec 26, 2024 · The letter phi (φεῖ), the 21st letter of the ancient Greek alphabet. Φ • (F) (uppercase, lowercase φ) The upper case letter phi (φι), the 21st letter of the modern Greek alphabet.

We love Greek letters in mathematics, because we are always in need of symbols for concepts, constants, and variables. We note common usage, but they can get used in many different and imaginative ways. Name Lowercase ... Phi: φ: Golden Ratio: Φ: Chi ...

Feb 14, 2025 · Φ, the 21st letter of the Euclidean and modern Greek alphabet, usually romanized as "ph". (mathematics) The golden ratio. A visual illusion whereby a sequential pattern of lights produces a false sense of motion.