Talk:Pi (disambiguation)

-- Since the mathematical pi is the best known, surely it should be second on the list, under the letter?

Is there some reason the movie gets "π" but the letter, number, and meson get "pi"? Surely all four should just be wikified in a REAL-LINK|π form? (I don't know about chemists and pi bonds.)

I put the Greek pi links in historical order. I changed "In chemistry, ..." to "..., in chemistry", since in a two part phrase, the key item should be first. (As opposed to common WP article starts, where "In chemistry, ..." seeks to orient.) The adjective "mathematical" is more readable than the "mathematics and related fields" phrase.--192.35.35.35 16:43, 18 Feb 2005 (UTC)

Moved stuff
I'm moving the following here because either the entries lack articles and/or they are uncyclopedic for the purposes of wikipedia (e.g. wikipedia is not a slang dictionary). Note that the first entry, pi as a multiplication operator, is covered in the Pi (letter) article which is already linked to. -- jiyTalk 17:26, August 16, 2005 (UTC)


 * In mathematics, the capital letter Π is occasionally used as a symbol for the product operator, multiplying the terms of a sequence (compare use of Σ for the summation operator).
 * pi is typesetting jargon for a random jumble of characters.
 * pi is British slang for "preachy" or "goody-goody", from "pious".
 * PI is Prussian Instructions (Preußische Instruktionen), a German library cataloguing system used from 1898 until the 1970s.
 * PI is an abbreviation for Processing Instruction in SGML and XML.
 * PI is Push Initiator in WAP push

Greek letter on top
Doesn't this contradict the rule that the primary meaning (the mathematical constant, which is at Pi) should always go on top?? Georgia guy 15:55, 22 September 2006 (UTC)

Reformatted page to show contents
This page has a large ammount of different articles to link to, I've sorted it to try to help people get to where they want asap. I've left the main pi article link at the top. I know it's normal for disambiguation pages to be a simple list of links, but with 42, I believe this is an exceptionThe18thDoctor 01:46, 18 January 2007 (UTC)

Just checking
Isn't Police Investigator also abbreviated as P.I.? Kennard2 02:05, 25 March 2007 (UTC)

pressure measurement
Does the abbreviation P.I. have a meaning in the field of instrumentation for measuring pressure in a fluid? — Preceding unsigned comment added by Skysong263 (talk • contribs) 21:28, 20 March 2011 (UTC)

Some Cleaning
I am in the process of making some changes. In a couple of days I will follow through, if contrarians don't show up.

Deletions

 * Pi Recordings, a record label --> never shown as Pi alone, either in linked page or in Official Website
 * Is clearly referred to as Pi alone in both the official site and in published sources
 * π-calculus --> never shown as Pi alone in linked page
 * Raspberry Pi, a Single Board Computer --> never shown as Pi alone, either in linked page or in Official Website / Twitter
 * Is clearly referred to as Pi alone in both the official site and in published sources
 * π(x), the reciprocal of the Pi reciprocal --> no links to any pages, so it shouldn't belong to a disambiguation page, and, anyway, Pi reciprocal does not differ, in concept and meaning, from the reciprocal of any other number
 * Pi Studios --> never shown as Pi alone in linked page
 * The logo is a stylized pi symbol -- though that article needs help wrt references
 * Pi Islands --> error - these islands are called Psi Islands (the topic was added to Psi disambiguation page
 * Pi Islands ≠ Psi Islands -- two different groups of islands
 * Primary immunodeficiency --> never mentioned in linked page as Pi
 * Polarity item in linguistics --> mentioned in linked page only as PPI or NPI (positive or negative polarity item). NPI topic has been added to NPI disambiguation page
 * Potential instability --> never mentioned in linked page as Pi
 * Privacy International --> never shown as Pi alone, either in linked page or in Official Website
 * clearly labelled as PI in the article, though the web site does not make obvious mentions of usage
 * Pasteur Institute never shown as Pi, either in linked page or in Official Website
 * Pirot, a city in Serbia (license plate code) --> There are many vehicle registration plates around the world with symbol PI which are well known by the locals and of little relevancy to any other person
 * Can't see that this as a valid reason for removing
 * Parameter indicator, in ISO standards --> never mentioned in linked page
 * Personal injury attorney --> PI never shown in linked page
 * The Philippines (from "Philippine Islands") --> its ISO 3166 code is PH
 * PI is an older pre-ISO abbreviation, perhaps still used informally, and perhaps still appearing in historical contexts. Unfortunately, no article describes this usage.
 * Piauí, a state in Brazil --> its ISO 3166 code is BR-PI
 * Poison Idea, American hardcore punk band --> never shown as Pi, either in linked page or in Official Website
 * Seattle Post-Intelligencer --> in linked page is mentioned as Seattle P-I or P-I, never PI
 * Dab pages for abbreviations typically include variant punctuation and capitalization.
 * Philippine Idol --> never shown as Pi in linked page
 * Marine Corps Recruit Depot Parris Island --> in linked page, as in other pages, is always abbreviated as MCRD PI, never PI alone

Changes & Corrections
Carlotm (talk) 10:22, 4 October 2013 (UTC)
 * Old topic
 * Revised topic
 * Pi (instrument), a variety of quadruple reed oboes used in the traditional music of Thailand
 * Pi, a generic term for a variety of double- or quadruple-reed oboes and a free-reed pipe of traditional Thai music
 * Pion or π, a subatomic particle
 * π, Pion, a subatomic particle
 * Osmotic pressure or Π
 * Π, Osmotic pressure
 * The product symbol
 * ∏, the capital Pi notation, symbol of the product of a sequence of terms
 * Prime-counting function or $&pi;(x)$
 * $&pi;(x)$, prime-counting function
 * $&pi;_{n}(X)$ the $n$th homotopy group of $X$
 * $&pi;_{n}(X)$, the $n$th homotopy group of $X$
 * Pi (.hack), a fictional character from the multimedia franchise .hack//G.U.
 * Pi, a fictional character from the multimedia franchise .hack//G.U.
 * Pi Magazine
 * Pi Media, Student publications of University College of London ( &pi; net, &pi; magazine, &pi; tv)
 * Pi County in Sichuan, China
 * Pi, county in Sichuan, China
 * Pi (film), a 1998 film directed by Darren Aronofsky
 * Pi, a 1998 film directed by Darren Aronofsky
 * Pi (state) a vassal state in Zhou Dynasty China (1046–256 BCE)
 * Pi, a vassal state in Zhou Dynasty China (1046–256 BCE)
 * An inorganic phosphate group (as Pi)
 * Pi, an inorganic phosphate
 * The isoelectric point (as pI)
 * pI, the isoelectric point
 * Sun Air (Fiji) (IATA airline code: PI)
 * PI, IATA airline code for the defunct Piedmont Airlines (1948–89)
 * In legal shorthand, it refers to a plaintiff
 * Π, plaintiff in legal shorthand
 * Partit per la Independència, a short lived political party in Catalonia of the 1990s
 * ''To be moved from subsection 'Other' to subsection 'Political parties'
 * Please see WP:MOSDAB on the use of piping for formatting (good) vs. for hiding the parenthetical part of a title (bad), for placing the blue link as close to the beginning as possible, and for linking to articles that address the ambiguous term. Some of your proposed changes are the contrarian view. -- JHunterJ (talk) 13:54, 4 October 2013 (UTC)
 * I was about to say much the same as JHJ. older ≠ wiser 13:58, 4 October 2013 (UTC)