### Caption

Pi frequency distribution representation, illustration. Frequency distribution of digits in Pi for the first 4,988 digits of Pi in groupings of 4. The layout is 29 columns and 43 rows. The first digit (3) is offset to the top left. For each grouping the number of times a digit was seen is proportional to the width of the ring. Pi (the sixteenth letter of the Greek alphabet) is the symbol used in mathematics to represent the constant of the ratio of the circumference of a circle to its diameter. It is a crucial element of periodic functions and is found in many formulae in trigonometry and geometry. The value of this ratio is approximately 3.14159. It has been calculated to over one trillion digits beyond its decimal point, though as an irrational and transcendental number it continues infinitely without repetition or pattern.