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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.
Phonetic use In English and most other European languages, P is a voiceless bilabial plosive ( in the IPA). A common digraph in English is "ph", which represents the voiceless labiodental fricative , and is commonly used to transliterate Phi ( 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" — see also List of Latin words with English derivatives). In German, the digraph "pf" is common, representing a labial affricate of and .
Meanings for P In baseball, P is the abbreviation for the position of pitcher. In biochemistry, P is the symbol for proline. In chemistry, P is the symbol for the element phosphorus, or sometimes for phosphate. In chess, P is sometimes used as a notation symbol for the pawn piece In computer science, * P is an operation on a semaphore, 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, <p> is the HTML tag to mark the beginning of paragraphs. In driving a motor vehicle, P designates the parking gear of an automatic transmission. In international licence plate codes, P stands for Portugal. In mathematics, blackboard bold represents the prime numbers In music, p stands for piano, meaning "softly". In New Zealand P is slang for pure methamphetamine. 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 (plural pence), for example 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. As the first letter of a postal code,* In Canada, P stands for Northern Ontario. 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 Roman naming convention, P is the abbreviation for the praenomen Publius. In symbolic logic, p is often used to denote a proposition as well as q and r. In economics, P is usually used to represent price levels. In photography, most SLR cameras use P to signify program mode, where the camera sets both aperture and shutter speed.
See also
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