The element represented by the symbol "H" is hydrogen. It is the lightest and most abundant element in the universe, composed of one proton and one electron. Hydrogen is a nonmetal and is fundamental in the composition of water (H2O) and organic compounds, making it essential for life on Earth. Additionally, hydrogen plays a crucial role in various chemical reactions, including combustion and the formation of stars. In the context of energy, hydrogen is increasingly being explored as a clean fuel alternative, especially in fuel cells and other renewable energy technologies.