Home > P

P is the 16th letter of the Latin alphabet.

Semitic Pê (mouth) as well as Greek Π or π ( Pi) and the Etruscan and Latin letters that developed from the former alphabet all symbolized /p/, a plosive, unvoiced consonant. Those who speak Arabic usually have difficulty pronouncing this sound; they pronounce like b instead.

Papa represents the letter P in the NATO phonetic alphabet.

1 Phonetic use

In English and most other European languages, P is a voiceless bilabial plosive ('p' in the IPA). A common digraph in English is "ph", which represents the voiceless labiodental fricative 'f', and is commonly used to transliterate φ in loanwords from Greek. Both initial and final P can be combined with many other discrete consonants in English words. A common example of assimilation is the tendency of prefixes ending in N to become M before P (such as "in" + "pulse" -> "impulse").

In German, the digraph "pf" is common, representing a labial affricate of 'p' and 'f'.

2 Meanings for P

• In baseball, P is the abbreviation for the position of pitcher.
• In biochemistry, P is the symbol for prolineProline is one of the twenty amino acids that are used by living organisms as a building block of proteins (so called proteinogenic amino acids). In proteins, proline can act as a structural disruptor for ( α) helices, and as a turning point in &bet.
• In chemistryChemistry is the science of matter and its interactions with energy (see physics, biology). Because of the diversity of matter (which is mostly atomic), Chemists are often engaged in the pursuit of studying how atoms interact to form molecules, and how mo, P is the symbol for the element phosphorusPhosphorus is the chemical element in the periodic table that has the symbol P and atomic number 15. A multivalent, nonmetal of the nitrogen group, phosphorus is commonly found in inorganic phosphate rocks and in all living cells but is never naturally fo, or sometimes for phosphateIn chemistry, a phosphate is a polyatomic ion or radical consisting of one phosphorus atom and four oxygen. In the ionic form, it carries a -3 formal charge, and is denoted PO3-. In a biochemical setting, a free phosphate ion in solution is called inorgan.
• In chessFor other meanings, see Chess (disambiguation). Chess (from the Persian word Shah is a board game for two players played on a square board divided into eight rows (or ranks and eight columns (or files creating 64 individual squares which alternate in colo, P is sometimes used as a notation symbol for the pawnThe pawns are the soul of chess. Philidor The pawn is the weakest and most numerous piece in the game of chess, representing infantry, or more particularly pikemen. Each player begins the game with eight pawns, one on each square of the second rank from t piece
• In computer scienceIn its most general sense, computer science CS or compsci is the study of computation and information processing, both in hardware and in software. Introduction Computer science encomposses a variety of topics relating to computation, ranging from abstrac,
  • P is an operation on a semaphoreA semaphore is a protected variable (or abstract data type) and constitutes the classic method for restricting access to shared resources (e. storage) in a multi-processing environment. They were invented by Edsger Dijkstra and first used in the THE opera, used for process synchronisation.
  • In complexity theory, P is the set of decision problems solvable in polynomial time on a deterministic Turing machine; see complexity classes P and NP.
• In computing,

  is the HTML tag to mark the beginning of paragraphs.

• In driving a motor vehicle, P designates the parking gear of an automatic transmission.
• Amongst drug users P is slang for pure methamphetamine.
• In international licence plate codes, P stands for Portugal.
• In mathematics, blackboard bold represents the prime numbers
• In the Metric system,
  • p, Pico, is an SI prefix meaning 10^-12.
  • P, Peta, is an SI prefix meaning 10¹⁵
  • p is the symbol for the pond, a now obsolete unit of force; see kilopond.
• In British coinage, it is the symbol for penny (pl. pence). i.e. 25p (25 pence).
• In physics,
  • p is the symbol for momentum or pressure
  • P is the symbol power or polarisation;
  • In particle physics, p is the symbol for the proton.
• In probability and statistics,
  • p denotes probability
  • the p-value of a given result in an experiment the is result's significance; that is, the probability of observing this result or a more extreme result, by chance alone.
• In publishing, a circled P, Ⓟ, represents a copyright on a sound recording.
• In symbolic logic, p is often used to denote a proposition as well as q and r.

• pa pb pc pd pe pf pg ph pi pj pk pl pm pn po pp pq pr ps pt pu pv pw px py pz

Letter-digit combinations starting with P:

• P0 P1 P2 P3 P4 P5 P6 P7 P8 P9