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'''P, p''' is a letter of the [[Latin alphabet]]. It is the sixteenth letter of most variants, being placed after [[O (letter)|O]] and before [[Q (letter)|Q]], as is the case for instance in the [[English alphabet]]. Its English name is pronounced [ˈpiː], like the vegetable ''pea''.

==Use in English==
{{:English_spellings/Catalogs/Masterlist}}
'''p''' is a bilabial stop, an unvoiced '''b''' (compare '''pén''' and '''Bén'''), a popping sound with the lips in the same position as '''m''' (as in '''mén''').  Examples (the accents show stress and pronunciation: see [[English spellings]]): '''póp, pâper, plûral, pêople, pét, pépper, pénsion, ápt, flípped, câper, apàrt, stoôp, recoûp, groûp, bürp, hàrp, stóp, cóp, rôpe, hŷpe, tŷpe'''.

'''p''' begins consonant clusters: '''ápfelstrudel, plús, apnoêa, hypnôsis, hypnótic, présent, Épsom, ápt'''.
 
'''p''' is silent at the beginning of a word before '''n, s, t''': '''pterodáctyl, pneumátic, pneumônia, pseûdonym, ptàrmigan, Ptólemy''' and in '''recêipt''', which rhymes with '''decêit''' (cf. '''recéption''' -psh-). It is also silent in '''cla'''p'''board''' and '''coû'''p.

It doubles only in the middle, to shorten the preceding vowel: '''hópping''' (cf. '''hópped, hôped'''), '''flóppy''' (cf. '''flóp'''), '''snápped, háppy, háppen, náppy, rípper, cúpped, stépping''', and after an initial vowel as in '''appŏrtion, appŏintment, apprôach, applŷ, opportûnity, úpper'''.

Usually, '''ph''' = '''f''': '''Phílip, trôphy, phenómenon, grāph, apóstrophê, Philadélphia, phãraôh''' (-rô); but '''Stêphen''' = '''Stêven''' and in some eastern words such as '''P'''h'''nóm Pén'''h, '''K'''h'''mér''', the '''h''' is silent, or, in slower speech, [[schwa]], in English. 

'''ph''' also begins clusters:  '''Dáphnê''' (-fn-), '''aphrodísiac''' (-fr-). 

Before '''p''', '''n''' becomes '''m''' (with the exception of '''ínpùt'''): '''impŏrtant, cómpost''', cf. -'''nf'''- in '''informâtion, confŏrm''' (which can be pronounced *ímformâtion, *comfŏrm - as can '''ínpùt''' *impùt, cf. '''impûte''').

'''mp''' is pronounced as '''n''' in '''comptrôller''' (= '''contrôller''').

==Scientific uses==

*p: proton
*p prefix: pico, 10<sup>-12</sup>
*p- prefix: old chemical notation, para