Neoplatonism. Samuel Plimsoll, English politician – Plimsoll line, Plimsoll shoe. Henry Stanley Plummer, American physician – Plummer's disease, Plummer–Vinson syndrome, Plummer's nail. Friedrich Carl Alwin Pockels, German physicist – Pockels effect, Pockels cell. Joel Roberts Poinsett, American politician and botanist – poinsettia Jean Léonard Marie Poiseuille, French physicist – poise, Poiseuille's Law. Joseph Polchinski, American physicist – Polchinski's paradox. Marco Polo, Italian explorer – Marco Polo sheep, Marco Polo (game). Madame de Pompadour, official chief mistress of King Louis XV - Pompadour (hairstyle). Charles Ponzi, Italian criminal – Ponzi scheme. Domenico Lorenzo Ponziani, Italian chess player – Ponziani Opening. Eugène Poubelle, French lawyer, administrator and diplomat – poubelle, French word for "dustbin". Pierre Poujade, French politician – Poujadism. Ferdinand Porsche, Italian car designer – Porsche. Grigori Aleksandrovich Potemkin, Russian general – Potemkin village. Percivall Pott, British surgeon – Pott's disease, Pott's fracture. Pierre Poujade, French politician – Poujadism. Enoch Powell, British politician – Powellism. Elvis Presley, American rock 'n' roll singer – Elvis impersonator, Elvis taxon, Elvis quiff. Priapus, Greek mythological character – priapism. Prince Edward, Duke of Kent and Strathearn, British prince – Prince Edward Island. Prince Rupert of the Rhine, German prince and inventor – Rupert's Land, Prince Rupert's drop, Prince metal or Prince Rupert metal. Procrustes, Greek mythological character – Procrustean bed, Procrustean measures (situations where different lengths or sizes or properties are fitted to an arbitrary standard, often with ruthless disregard of individual differences or special circumstances), Procrustes analysis, Generalized Procrustes analysis, Orthogonal Procrustes problem. William Procter and James Gamble, British businesspeople – Procter & Gamble. Prometheus, Greek mythological character – Prometheism, Promethium. William Prout, British chemist – Prout's hypothesis. Joseph Proust, French chemist – Proust's law, Proustite. Marcel Proust, French writer – Proustian, Proust Questionnaire. Proteus, Greek mythological character – the adjective "protean" (versatile, mutable, capable of assuming many forms), Proteus syndrome, Proteus effect. Karl Prusik, Austrian mountaineer – Prusikclimbing technique of going up or down a rope using knots. Nikolay Przhevalsky, Russisch biologist – Przewalski's horse James Puckle, British inventor – Puckle gun. Hermann, Fürst von Pückler-Muskau, German prince – Fürst-Pückler-Eis (Prince Pückler ice-cream). Carl P. Pulfrich, German physicist - Pulfrich effect. Joseph Pulitzer, Hungarian businessman – Pulitzer Prize. George Pullman, American businessman and engineer – Pullman sleeping cars. Jan Evangelista Purkyně, Czech anatomist and physiologist – Purkinje cell, Purkinje effect, Purkinje shift, Purkinje images, Purkinje fibres. Pygmy, Greek mythological characters – Pygmy. Pyrrho,