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Pi (letter)
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{{Table_Greekletters|letter=pi}}
: ''For other uses, see
Pi (disambiguation)''
'''Pi''' (upper case Π, lower case π or ϖ) is the 16th letter of the
Greek alphabet. In the system of
Greek numerals it has a value of 80.
In Greek, the letter is pronounced {{IPA|/piË?/}} (as in ''pee''); in modern English, it is pronounced {{IPA|/paɪË?/}} (as the word ''pie''), in particular when referring to the
Pi mathematical constant (see below). In words, it is pronounced {{IPA|/p/}}. In
Modern Greek, the sequence of letters μπ represents the {{IPA|/b/}} sound, as in ''boy'' (the second letter of the Greek alphabet is now pronounced {{IPA|/v/}} as in ''very'').
There is another variant of lower case Pi, resembling a lower case
Omega:
.
The upper-case letter Î is used as a symbol for:
* The
product (mathematics) 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:
* The mathematical irrational
Pi constant '''π''' ≈ 3.14159..., the ratio of a
circle's circumference to its diameter in
Euclidean geometry.
* The
prime counting function in mathematics.
* Dimensionless parameters constructed using the
Buckingham π theorem of
dimensional analysis.
* The
elementary particle called the
pion 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.
Category:Greek letters
als:Î
bg:Пи (буква)
ca:Î
da:Pi (bogstav)
de:Pi
el:Πι
es:Î
fr:Pi (lettre grecque)
ko:Î
he:פ×?×™ (×?ות)
nl:Pi (letter)
nds:Pi
ja:Î
nn:Î
pl:Pi (litera)
pt:Î
sk:PÃ (pÃsmeno)
sv:Pi (bokstav)
zh:Î
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