ph2, ph-2, ph.2 or variant, may refer to: AMD Phenom II CPU chip PH2 (Planet Hunters 2), star system with a planet PH2 b, a planet around that star 1991 PH2 or 9341 Gracekelly 1992 PH2 or (13089) 1992 PH2 Hall PH-2, biplane flying boat Pander PH.2 Mayer, see List of aircraft (P) biphenyl, Ph2 or Ph-Ph Phenolphthalein, ph2 or phph PH2, a postcode in Perth, Scotland, see PH postcode area PH2− the phosphanide ion in inorganic chemistry -PH2 the phosphanyl group in organic chemistry