section_path: Fundamentals/Name
section_name: Name
paragraph_text: Name
  
  The symbol used by mathematicians to represent the ratio of a circle's circumference to its diameter is the lowercase Greek letter π, sometimes spelled out as pi. In English, π is pronounced as "pie" (/ p aɪ / PY). In mathematical use, the lowercase letter π is distinguished from its capitalized and enlarged counterpart Π, which denotes a product of a sequence, analogous to how Σ denotes summation.
  
  The choice of the symbol π is discussed in the section Adoption of the symbol π.