golden ratio

golden ratio (plural golden ratios)

1. (geometry) The irrational number (approximately 1.618), usually denoted by the Greek letter φ (phi), which is equal to the sum of its own reciprocal and 1, or, equivalently, is the square root of the sum of itself and 1.

   Synonyms: golden number, golden section

• algebraic number
• algebraic integer
• irrational number
• quadratic integer

•   golden ratio on Wikipedia.Wikipedia
• divine proportion
• extreme ratio
• golden cut
• golden mean
• golden proportion
• golden rectangle
• golden section
• mean ratio
• sectio divina
• φ