Corps simple de symbole P qui existe sous plusieurs formes et qui doit son nom u fait que l'une des variétés est luminescente ; le phosphore rouge est le plus courant, nombre atomique 15, masse atomique 30,97.
16th letter of the English alphabet. In Semitic languages, in Greek, and in Latin p had much the same sound as it normally has today in English when final, or when following s at the beginning of a word, the sound of an unvoiced labial stop. In other positions in English, and especially when initial, p is aspirated.