phosphorus, P, atomic number 15 (noun)
a multivalent nonmetallic element of the nitrogen family that occurs commonly in inorganic phosphate rocks and as organic phosphates in all living cells; is highly reactive and occurs in several allotropic forms
P, p (noun)
the 16th letter of the Roman alphabet
A "pure" form of an illegal drug, especially heroin.
The set of all problems that are solvable in polynomial time by a deterministic Turing machine
P is the sixteenth letter of the ISO basic Latin alphabet.
P (named pee ) is the 16th letter of the modern English alphabet and the ISO basic Latin alphabet.