- Pi is the 16th letter of the Greek alphabet, or the numerical value of the ratio of the circumference of a circle to its diameter.
- Π is the symbol for Pi in the Greek alphabet.
- 3.1415 is an example of Pi.
pi
noun
- the sixteenth letter of the Greek alphabet (Π, π)
- the symbol (π) designating the ratio of the circumference of a circle to its diameter
- the ratio itself, equal to 3.14159265+: often approximated as
Origin of pi
Classical Greek pi, earlier pei ; from Semitic as in Classical Hebrew (language) pēpi
noun
- The 16th letter of the Greek alphabet. See Table at alphabet.
- Mathematics A transcendental number, approximately 3.14159, represented by the symbol &pgr;, that expresses the ratio of the circumference to the diameter of a circle and appears as a constant in many mathematical expressions.
Origin of pi
Late Greek pī, from Greek pei, of Phoenician origin; see p in Semitic roots.abbreviation
pi
(plural pis)
- The name of the sixteenth letter of the Classical and Modern Greek alphabets and the seventeenth in Old Greek.
- (mathematics) An irrational and transcendental constant representing the ratio of the circumference of a Euclidean circle to its diameter; approximately 3.1415926535897932384626433832795; usually written π.
- (letterpress typography) Metal type that has been spilled, mixed together, or disordered. Also called pie.
(third-person singular simple present pies, present participle piing, simple past and past participle pied)
- (letterpress typography) To spill or mix printing type. Also, "to pie".
(not comparable)
- (typography) Not part of the usual font character set; especially, non-Roman type or symbols as opposed to standard alphanumeric Roman type.
- In computing, pi characters are entered with special combinations of keys like ctrl-alt-x, or via character sequences such as {.
- cicero
- pica stick
pi - Computer Definition
The sixteenth letter of the Greek alphabet, is used to mathematically represent the ratio of the circumference of a circle to its diameter, which is equal to 3.14159265358979323846. . . . Pi is an infinite decimal, at least as far as we know. Pi has been calculated to many millions of decimal places, but to no end. Further, no repeating pattern has ever been discovered, and many mathematicians maintain that a repeating pattern is impossible. Pi has many important mathematical uses. For example, the area of a circle is pi times the square of the length of the radius, or A = r 2 , or pi r squared. Everyone, from middle school, knows that to be impossible, of course -- pies are round, some cakes are squared.
The 16th letter of the Greek alphabet. It is used as a symbol for the ratio of the circumference of a circle to its diameter, which is 3.141592653, commonly rounded to 3.14. Perhaps no other number has been more pondered, examined and calculated than pi. Circa 1650 B.C., the ratio was computed by an Egyptian scribe, and the number was recorded as 3.16049 in the Rhind Papyrus. The writings described how to create a square area the same size as a circle. The Exact Value of Pi Over the years, pi, which was named some 3,000 years later, has been calculated numerous times to the maximum decimal place that humans and calculating devices could take it. In 1596, it was calculated to 32 decimal places and up to 127 places by 1719. In 1949, the ENIAC took 70 hours to yield 2,037 digits. However, in 1997, a Hitachi mainframe computed pi to 51.5 billion digits in 29 hours. The bottom line is that the absolutely exact value of pi cannot be computed.