The chemical symbol for the element sodium is Na. This symbol originates from the Latin name "Natrium," which refers to sodium compounds present in natron, a natural mineral form. Sodium is an alkali metal and is highly reactive, especially with water, where it forms sodium hydroxide and hydrogen gas. It plays a crucial role in many biological processes, including nerve function and muscle contraction. Sodium is also essential in various industries, particularly in the production of glass, soap, and detergents. Due to its reactivity, sodium is typically found in nature only in compound forms rather than as a free element.