The Olympus µ[mju:] series of cameras were fully automatic compact cameras made by Olympus, starting in 1991. It was an immensely successful range, with 20 million models sold in the first ten years of production. The key selling points of mju cameras were the small size, accurate focusing, well-balanced flash exposures, and (starting with the mju-II) weatherproof finish. Most of the models could fit inside a soap dish. µ is a Greek letter that is used in science to mean "micro". "Mju" is pronounced to rhyme with "pew"