Which position in the Greek alphabet of 24 letters is the letter Pi?

'Pi', is 16th letter of the Greek alphabet, also used to represent one of the most widely known mathematical constants, also referred to as Archimedes' constant. The constant or symbol shown in the sculpture picture suggests 'pi', defined as the ratio of the circumference of a circle to its diameter. Stated another way, pi equals the circumference divided by the diameter ('pi' = c/d).

'Pi' has been represented by the Greek letter since the mid-18th century. Around 250 BCE (Before Common Era), the Greek mathematician Archimedes created an algorithm (a process or set of rules to be followed by calculations or other problem-solving operations). Then in the 5th century CE (Common Era) Chinese mathematicians approximated it to seven digits (3.141592), while Indian mathematics made a five-digit approximation (3.1416), both using geometrical techniques. Slight variations in approximations are also recorded from both Chinese and Indian mathematicians as well as mathematicians over time.

Because the definition relates to the circle, 'pi', it is found in many 'formulae' in trigonometry and geometry, especially those involving circles, ellipses and spheres.

The outdoor 'pi' sculpture in the picture is located at the Seward Johnson Center for the Arts, in Hamilton, New Jersey midway between Philadelphia and New York City. It is called "Power of Pi."