The 21st letter of the Greek alphabet (Φ, φ), commonly used in mathematics and science to represent the golden ratio or magnetic flux.
From Greek phi (φεῖ), the name of the Greek letter. In mathematics, it became associated with the golden ratio (approximately 1.618) due to its frequent use in geometric and mathematical contexts since ancient times.
The golden ratio phi appears throughout nature in surprising ways - from the spiral of nautilus shells to the arrangement of seeds in sunflowers and the proportions of the human body. Ancient Greeks considered it the most aesthetically pleasing proportion.
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