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Best Answer: w/w- an abbreviation for by weight, used in chemistry and pharmacology to describe the concentration of a substance in a mixture or solution ...
In chemistry and optical engineering, photons are usually symbolized by hÎ½, the energy of a photon, where h is Planck's constant and the Greek letter Î½ (nu) is the photon's frequency. Much less commonly, the photon can be symbolized by hf, where its frequency is denoted by f.