# Online Encyclopedia

# P

Latin alphabet | |||||
---|---|---|---|---|---|

Aa | Bb | Cc | Dd | ||

Ee | Ff | Gg | Hh | Ii | Jj |

Kk | Ll | Mm | Nn | Oo | Pp |

Rr | Ss | Tt | Uu | Vv | |

Ww | Xx | Yy | Zz |

**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 ('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'.

## 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 New Zealand P is slang for pure methamphetamine.
- In the Metric system,
- 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*.

Two-letter combinations starting with P:

Letter-digit combinations starting with P: