Editing Pi (section)

=== Memorizing digits ===
{{Main|Piphilology}}
[[Piphilology]] is the practice of memorizing large numbers of digits of {{pi}},{{sfn|Arndt|Haenel|2006|pp=44–45}} and world-records are kept by the ''[[Guinness World Records]]''.  The record for memorizing digits of {{pi}}, certified by Guinness World Records, is 70,000 digits, recited in India by Rajveer Meena in 9 hours and 27 minutes on 21 March 2015.<ref>[http://www.guinnessworldrecords.com/world-records/most-pi-places-memorised "Most Pi Places Memorized"] {{webarchive|url=https://web.archive.org/web/20160214205333/http://www.guinnessworldrecords.com/world-records/most-pi-places-memorised |date=14 February 2016 }}, Guinness World Records.</ref>  In 2006, [[Akira Haraguchi]], a retired Japanese engineer, claimed to have recited 100,000 decimal places, but the claim was not verified by Guinness World Records.<ref name="japantimes">{{cite news |first=Tomoko |last=Otake |url=<!-- http://www.lacim.uqam.ca/~plouffe/inspired2.pdf -->http://www.japantimes.co.jp/life/2006/12/17/general/how-can-anyone-remember-100000-numbers/ |title=How can anyone remember 100,000 numbers? |work=[[The Japan Times]] |date=17 December 2006 |access-date=27 October 2007 |url-status=live |archive-url=https://web.archive.org/web/20130818004142/http://www.japantimes.co.jp/life/2006/12/17/life/how-can-anyone-remember-100000-numbers/ |archive-date=18 August 2013}}</ref>

One common technique is to memorize a story or poem in which the word lengths represent the digits of {{pi}}: The first word has three letters, the second word has one, the third has four, the fourth has one, the fifth has five, and so on. Such memorization aids are called [[mnemonic]]s. An early example of a mnemonic for pi, originally devised by English scientist [[James Hopwood Jeans|James Jeans]], is "How I want a drink, alcoholic of course, after the heavy lectures involving quantum mechanics."{{sfn|Arndt|Haenel|2006|pp=44–45}} When a poem is used, it is sometimes referred to as a ''piem''.<ref>{{cite book |last=Danesi |first=Marcel |chapter=Chapter 4: Pi in Popular Culture |date=January 2021 |doi=10.1163/9789004433397 |page=[https://books.google.com/books?id=tAsOEAAAQBAJ&pg=PA97 97] |publisher=Brill |title=Pi ({{pi}}) in Nature, Art, and Culture |isbn=9789004433373 |s2cid=224869535}}</ref> Poems for memorizing {{pi}} have been composed in several languages in addition to English.{{sfn|Arndt|Haenel|2006|pp=44–45}}  Record-setting {{pi}} memorizers typically do not rely on poems, but instead use methods such as remembering number patterns and the [[method of loci]].<ref>{{cite journal |last1=Raz |first1=A. |last2=Packard |first2=M. G. |year=2009 |title=A slice of pi: An exploratory neuroimaging study of digit encoding and retrieval in a superior memorist |journal=Neurocase |volume=15 |issue=5 |pages=361–372 |doi=10.1080/13554790902776896 |pmid=19585350 |pmc=4323087}}</ref>

A few authors have used the digits of {{pi}} to establish a new form of [[constrained writing]], where the word lengths are required to represent the digits of {{pi}}. The ''[[Cadaeic Cadenza]]'' contains the first 3835 digits of {{pi}} in this manner,<ref>{{cite web |first=Mike |last=Keith |author-link=Mike Keith (mathematician) |url=http://www.cadaeic.net/comments.htm |title=Cadaeic Cadenza Notes & Commentary |access-date=29 July 2009 |url-status=live |archive-url=https://web.archive.org/web/20090118060210/http://cadaeic.net/comments.htm |archive-date=18 January 2009}}</ref> and the full-length book ''Not a Wake'' contains 10,000 words, each representing one digit of {{pi}}.<ref name=KeithNAW>{{cite book |last=Keith |first=Michael |title=Not A Wake: A dream embodying (pi)'s digits fully for 10,000 decimals |publisher=Vinculum Press |isbn=978-0-9630097-1-5 |author2=Diana Keith |date=17 February 2010}}</ref>