MARTIN KRZYWINSKI / SCIENCE PHOTO LIBRARY MARTIN KRZYWINSKI / SCIENCE PHOTO LIBRARY
Pi number spiral representation, illustration. Pi arranged in a spiral, with a tail. The first digit is at the start of the tail at top left. The last digit is in the centre of the spiral. 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.
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