Web2P may refer to: Science. 2P/Encke, official designation of Comet Encke; 2p, an arm of Chromosome 2 (human) 2p, an atomic orbital for electrons; Two-photon absorption; Two-photon excitation microscopy; Transportation. Airphil Express, a Philippines airline, IATA code 2P; LMS Class 2P 4-4-0, a British locomotive; Other