The chemical element represented by the letter "Fe" is iron. Iron is one of the most abundant elements on Earth, constituting a significant part of the planet's core and crust. It has the atomic number 26 and is known for its metallic properties, such as strength and malleability. Commonly found in ores like hematite and magnetite, iron plays a vital role in various applications, including construction, manufacturing, and the production of steel. Additionally, iron is essential for biological processes, particularly in the formation of hemoglobin, which carries oxygen in the blood.