ϕ (Phi) is a mathematical constant approximately equal to 1.6180339887. It is known as the golden ratio and is often found in nature, art, and architecture. The golden ratio occurs when a line is divided into two parts, such that the ratio of the whole line to the longer part is the same as the ratio of the longer part to the shorter part. This unique ratio has fascinated mathematicians and artists for centuries. It appears in various forms, such as the arrangement of leaves in plants, the proportions of the Parthenon, and the works of Leonardo da Vinci. The aesthetic appeal of ϕ has made it a popular subject in both mathematics and the arts.