Phi (Φ), also known as the golden ratio, is a mathematical constant approximately equal to 1.6180339887. It is often found in nature, art, and architecture, representing an aesthetically pleasing proportion. The ratio is derived from the Fibonacci sequence, where the ratio of consecutive numbers approaches Φ as the sequence progresses. In mathematics, Φ can be expressed algebraically as (1 + √5) / 2. This unique number has fascinated mathematicians, artists, and scientists for centuries, appearing in various forms such as spirals, patterns in leaves, and even in the works of Leonardo da Vinci. Its properties make it a significant topic in both mathematics and the arts.