K+ is the symbol for the potassium ion, which is a positively charged ion (cation) of the element potassium. It plays a crucial role in various biological processes, including nerve function, muscle contraction, and maintaining fluid balance in cells. Potassium is essential for human health and is commonly found in foods like bananas, oranges, and potatoes. In chemistry, K+ is formed when a potassium atom loses one electron, resulting in a net positive charge. This ion is vital in the field of electrochemistry and is involved in the generation of electrical signals in the body, particularly in the nervous system and heart.