Greek alphabet
Α α Alpha	Ν ν Nu
Β β Beta	Ξ ξ Xi
Γ γ Gamma	Ο ο Omicron
Δ δ Delta	Π π Pi
Ε ε Epsilon	Ρ ρ Rho
Ζ ζ Zeta	Σ σ ς Sigma
Η η Eta	Τ τ Tau
Θ θ Theta	Υ υ Upsilon
Ι ι Iota	Φ φ Phi
Κ κ Kappa	Χ χ Chi
Λ λ Lambda	Ψ ψ Psi
Μ μ Mu	Ω ω Omega
Obsolete letters
Ϝ ϝ Digamma	Ϻ ϻ San
Ϙ ϙ Qoppa	Ϡ ϡ Sampi
Ϛ ϛ Stigma	Ϸ ϸ Sho

For other uses, see Pi (disambiguation)

Pi (upper case Π, lower case π or ϖ) is the sixteenth letter of the Greek alphabet. In the system of Greek numerals it has a value of 80. Image File history File links Greek_alphabet_pi. ... Due to technical limitations, some web browsers may not display some special characters in this article. ... Alpha (uppercase Α, lowercase α) is the first letter of the Greek alphabet. ... For other uses, see Nu. ... Beta (upper case Î’, lower case β) is the second letter of the Greek alphabet. ... Xi (upper case Ξ, lower case ξ) is the 14th letter of the Greek alphabet. ... Gamma (uppercase Γ, lowercase γ) is the third letter of the Greek alphabet. ... Omicron (upper case Ο, lower case ο, literally small o) is the 15th letter of the Greek alphabet. ... For other uses, see Delta. ... For the 2005 hurricane, see Hurricane Epsilon. ... Rho (upper case Ρ, lower case ρ) is the 17th letter of the Greek alphabet. ... Zeta (upper case Ζ, lower case ζ) is the sixth letter of the Greek alphabet. ... For other uses, see Sigma (disambiguation). ... For other uses, see Eta. ... Tau (upper case Τ, lower case Ï„) is the 19th letter of the Greek alphabet. ... Theta (upper case Θ, lower case θ or ) is the eighth letter of the Greek alphabet. ... Upsilon (upper case , lower case ) is the 20th letter of the Greek alphabet. ... For programming language, see Iota and Jot. ... Phi (upper case Φ, lower case φ or ) is the 21st letter of the Greek alphabet. ... For other uses, see Kappa (disambiguation). ... Chi (upper case Χ, lower case χ) is the 22nd letter of the Greek alphabet. ... Lambda (upper case Λ, lower case λ) is the 11th letter of the Greek alphabet. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... For other uses, see Mu. ... Note: This article contains special characters. ... Digamma (upper case , lower case ) is an archaic letter of the Greek alphabet, used primarily as a Greek numeral. ... San (uppercase , lowercase ) was a letter of the Greek alphabet, appearing between Pi and Qoppa in alphabetical order, corresponding in position although not in name to the Phoenician tsade. ... Qoppa Qoppa is an obsolete letter of the Greek alphabet and has a numeric value of 90. ... Sampi (Upper case Ϡ, lower case ϡ) is an obsolete letter of the Greek alphabet and has a numeric value of 900. ... Stigma is a ligature of the Greek letters sigma and tau, sometimes used nowadays to represent the Greek numeral 6. ... Sho (uppercase , lowercase ) was a letter added to the Greek alphabet in order to write the Bactrian language. ... Look up pi in Wiktionary, the free dictionary. ... Due to technical limitations, some web browsers may not display some special characters in this article. ... Greek numerals are a system of representing numbers using letters of the Greek alphabet. ...

In Greek, the letter is pronounced /piː/ (as in pee); in modern English, it is pronounced /paɪː/ (as the word pie), in particular when referring to the mathematical constant (see below). In words, it is pronounced /p/. In Modern Greek, the sequence of letters μπ represents the /b/ sound, as in boy (the second letter of the Greek alphabet is now pronounced /v/ as in very). Lower-case Ï€ (the lower case letter is usually used for the constant) The mathematical constant Ï€ is an irrational number, approximately equal to 3. ... Modern Greek (Νεοελληνική, lit. ...

There is another variant of lower case Pi, resembling a lower case Omega: . Note: This article contains special characters. ...

The upper-case letter Π is used as a symbol for:

• The product operator in mathematics (in analogy to the use of the capital Sigma Σ as summation symbol).
• In textual criticism, Codex Petropolitanus, a 9th century, uncial codex of the Gospels, now located in St. Petersburg, Russia.

The lower-case letter π is used as a symbol for: For other uses, see Sigma (disambiguation). ... Summation is the addition of a set of numbers; the result is their sum. ... Textual criticism or lower criticism is a branch of philology or bibliography that is concerned with the identification and removal of errors from texts. ... As a means of recording the passage of time the 9th century was that century that lasted from 801 to 900. ... The Book of Kells, c. ... first page of the Codex Argenteus A codex (Latin for block of wood, book; plural codices) is a handwritten book, in general one produced from Late Antiquity through the Middle Ages. ... For other uses, see Gospel (disambiguation). ... Saint Petersburg  listen (Russian: Санкт-Петербу́рг, English transliteration: Sankt-Peterburg), colloquially known as Питер (transliterated Piter), formerly known as Leningrad (Ленингра́д, 1924–1991) and Petrograd (Петрогра́д, 1914–1924), is a city located in Northwestern Russia on the delta of the river Neva at the east end of the Gulf of...

• The mathematical irrational constant π ≈ 3.14159..., the ratio of a circle's circumference to its diameter in Euclidean geometry. In Classical Greek it was also intended as a shorthand for the word perimetros or (περιμετρος) peri meaning "around" and "metros" to measure or measurement. Its equivalent in Latin being the slightly more familiar "circumference".
• The prime counting function in mathematics.
• Dimensionless parameters constructed using the Buckingham π theorem of dimensional analysis.
• The osmotic pressure in chemistry. π=MRT
• The elementary particle called the pi meson or pion.
• Profit in microeconomics.
• Inflation rate in macroeconomics.
• A type of chemical bond in which the P-orbitals overlap

In HTML, the capital letter Π can be produced using the codes Π or Π, and the lower-case by using π or π within the source code. Lower-case Ï€ (the lower case letter is usually used for the constant) The mathematical constant Ï€ is an irrational number, approximately equal to 3. ... In Euclidean geometry, a circle is the set of all points in a plane at a fixed distance, called the radius, from a fixed point, the centre. ... Euclid Euclidean geometry is a mathematical system due to the Hellenistic mathematician Euclid of Egypt. ... Latin is an ancient Indo-European language. ... In mathematics, the prime counting function is the function counting the number of primes less than or equal to some real number x. ... The Buckingham Ï€ theorem is a key theorem in dimensional analysis. ... Dimensional analysis is a conceptual tool often applied in physics, chemistry, and engineering to understand physical situations involving a mix of different kinds of physical quantities. ... Osmotic pressure or turgor (also called turgor pressure) is the pressure produced by a solution in a space that is enclosed by a differentially permeable membrane. ... In particle physics, an elementary particle or fundamental particle is a particle not known to have substructure; that is, it is not made up of smaller particles. ... In particle physics, pion (short for pi meson) is the collective name for three subatomic particles: Ï€0, Ï€+ and π−. Pions are the lightest mesons and play an important role in explaining low-energy properties of the strong nuclear force. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... A chemical bond is the physical phenomenon of chemical substances being held together by attraction of atoms to each other through sharing, as well as exchanging, of electrons or electrostatic forces. ... An excerpt of HTML code with syntax highlighting In computing, HyperText Markup Language (HTML) is a markup language designed for the creation of web pages with hypertext and other information to be displayed in a web browser. ...