Editing Pi (letter) (section)

== Uppercase Pi ==
The uppercase letter Π is used as a symbol for:
* In textual criticism, ''[[Codex Petropolitanus (New Testament)|Codex Petropolitanus]]'', a 9th-century [[uncial]] [[codex]] of the [[Gospel]]s, now located in [[St. Petersburg, Russia]].
* In [[legal shorthand]], it represents a [[plaintiff]].<ref>{{Cite web |last=sinclair |date=2024-01-22 |title=The Top Legal Symbol Keyboard Shortcuts You Should Know |url=https://lawrank.com/top-legal-keyboard-shortcuts/ |access-date=2025-01-18 |website=LawRank |language=en-US |quote=If you work with plaintiffs, you may choose to replace the word “plaintiff” with a symbol in some of your writing. The plaintiff symbol looks like the Greek letter pi (π).}}</ref>
* In [[Mathematical finance]], it represents a portfolio.

[[Greek letters used in mathematics, science, and engineering|In science and engineering]]:
* The [[product (mathematics)|product]] operator in mathematics, indicated with [[Multiplication#Capital pi notation|capital pi notation]] {{Math|Π}} (in analogy to the use of the capital [[Sigma]] {{Math|Σ}} as [[summation]] symbol).<ref>{{Cite web |last=Weisstein |first=Eric W. |title=Product |url=https://mathworld.wolfram.com/Product.html |access-date=2025-01-18 |website=mathworld.wolfram.com |language=en}}</ref>
* The [[osmotic pressure]] in chemistry.<ref>{{Cite web |date=2015-01-18 |title=13.7: Osmotic Pressure |url=https://chem.libretexts.org/Bookshelves/General_Chemistry/Map:_General_Chemistry_(Petrucci_et_al.)/13:_Solutions_and_their_Physical_Properties/13.07:_Osmotic_Pressure |access-date=2025-01-18 |website=Chemistry LibreTexts |language=en}}</ref>
* The [[viscous stress tensor]] in continuum mechanics and fluid dynamics.