The element represented by the symbol He is helium. Helium is a colorless, odorless, and inert gas that belongs to the noble gas group in the periodic table. It is the second lightest and second most abundant element in the observable universe after hydrogen. Helium is widely known for its use in filling balloons, providing lift due to its lower density compared to air. Additionally, it has applications in cryogenics, as a cooling medium for superconducting magnets, and in other scientific and industrial processes. Helium is non-toxic and non-flammable.