The term 'GAS USED IN LASERS' refers to two gases, NEON and XENON. NEON is a noble gas that is colorless, odorless, and tasteless. It is used in lasers due to its ability to produce a bright light when excited by an electric current. XENON is also a noble gas that is colorless, odorless, and tasteless. It is used in lasers because of its ability to produce a very intense beam of light when excited by an electric current. Both NEON and XENON are used in lasers to create a powerful beam of light that can be used for various applications.