Krypton is a chemical element with the symbol Kr and atomic number 36. It is a colorless, odorless, tasteless noble GAS that is found in trace amounts in the atmosphere and is often used in fluorescent lamps and advertising signs. Krypton is also the name of the fictional planet from which Superman originates. The crossword solutions for the term Krypton are GAS (3 letters), NOBLEGAS (8 letters), and SUPERMANSPLANET (15 letters).