# P (disambiguation)

P, or p, is the sixteenth letter of the English alphabet.
P may also refer to:
* Rho (letter), in Greek alphabet; the lowercase p is also sometimes confused with the lowercase Rho, ρ or ϱ
* Er (Cyrillic), in Cyrillic alphabet; it is sometimes confused with the Latin letter P
* 𝔓$^n$ siglum for New Testament papyrus with Gregory-Aland number n
* In linguistics, P (also O), the patient-like argument (object) of a canonical transitive verb
* Encircled P, or ℗, is the sound recording copyright symbol
* p., an abbreviation for page when referencing a page number in a print publication
* Portugal country code in the vehicle registration plates of the European Union
* Parking, see also Parking (disambiguation).
* P (Nazi symbol), worn by Polish forced labourers during Nazi occupation
* P, the aircraft registration prefix for North Korean planes
* P, an abbreviation of gridiron football position punter

## Arts, literature and music

* P, code for the Paris Herbarium at the Muséum national d'histoire naturelle
* P, the ancient Greek author of the Hellenica Oxyrhynchia
* P, the production code for the 1965 Doctor Who serial The Crusade
* P (film), a 2005 Thai film
* "P" Is for Peril, a 2001 novel by Sue Grafton
* P, an abbreviation of Pinxit
* p or piano, a dynamic direction to play softly
* P, priestly source of the Hebrew Bible
* Agent P, the codename for Perry the Platypus in Phineas and Ferb

### Music

* P (band), a 1993–95 American alternative rock band
** P (album), the 1995 eponymous release by American alternative rock band P
* "P," a song from the Venetian Snares album Cavalcade of Glee and Dadaist Happy Hardcore Pom Poms
* "P", a song by American rapper Jaden from his 2019 album ERYS

## Computing

* P, the usual name for the operation to acquire a semaphore
* <p>...</p>, the HTML element used to create a paragraph
* P-type semiconductor
* P (programming language), developed by Microsoft and UC, Berkeley
* Primitive programming language P′′
* p, a suffix unit for video resolution (vertical Progressive-scan lines), as in 720p or 1080p
* The P convention in communication

## Mathematics

* p-value, in statistical hypothesis testing
* P (complexity), a complexity class in computational complexity theory
* #P complexity class
* P, universal parabolic constant
* Pi
* P or $\mathbb {P}$ - the set of all primes and p an individual prime
* ℘-functions or p-functions, are the Weierstrass elliptic function
* p-series, a common name for the Harmonic series (mathematics)
* P, Projective space

## Money, corporate

* P (instead of ₱), a symbol often used for the Philippine peso
* p is a symbol for penny
* P, the New York Stock Exchange ticker symbol for Pandora Media, Inc., the corporate owner of Pandora Radio
* P, Panasonic's mobile phones in Japan
* Railpower Technologies (TSX: P), a Canadian company that builds environmentally friendly hybrid yard locomotives

## Science

* p, the symbol for momentum in physics
* P, the symbol for power (physics)
* P, the symbol for proposition
* Pulse, the rate of heartbeats
* °P, the unit in descriptions of alcohol proof
* Poise, the unit for dynamic viscosity in the centimetre gram second system of units
* Phosphorus, symbol P, a chemical element
* p, the symbol for pressure
* p, the SI prefix symbol for pico-, 10$^{−12}$
* P, the SI prefix symbol for Peta-, 10$^{15}$
* p, approximates the negative common logarithm (base 10) in pH, the measure of acidity or basicity
* Haplogroup P (mtDNA), a human mitochondrial DNA (mtDNA) haplogroup
* Haplogroup P (Y-DNA), a Y-chromosomal DNA (Y-DNA) haplogroup
* Methamphetamine, nicknamed "P" in New Zealand
* p designates the short arm of a chromosome
* ATC code P Antiparasitic products, insecticides and repellents, a section of the Anatomical Therapeutic Chemical Classification System
* Proline, an amino acid abbreviated P or Pro
* P-factor, an aerodynamic effect
* p factor (psychopathology)

## Transportation

* Transilien Line P, a line of the Paris transport network
* P (Los Angeles Railway)
* The official West Japan Railway Company service symbol for:
** Sakurajima Line.
** Geibi Line.
* Nankō Port Town Line, an automated guideway line operated by the Osaka Metro, labeled

## Other uses

* Papa, the military time zone code for UTC−03:00