P (/ ? p i? /; named pee) [2] is the sixteenth letter of the basic modern Latin alphabet.
http://en.wikipedia.org/wiki/P

Phosphorus (pronounced /?f?sf?r?s/, FOS-f?r-?s) is the chemical element that has the symbol P and atomic number 15. A multivalent nonmetal of the nitrogen group ...
http://en.wikipedia.org/wiki/Phosphorus

p or P n. , pl. , p's , or P's , also ps or Ps . The 16th letter of the modern English alphabet. Any of the speech sounds represented by the letter
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