On airport runways, the letter "C" stands for "Center" and is used to identify the middle runway in a set of three parallel runways. Large international airports often have multiple runways aligned in the same magnetic direction to handle high traffic volumes. For example, if an airport has three runways aligned at 280 degrees, they would be labeled 28L (Left), 28C (Center), and 28R (Right) based on the pilot's perspective during approach. This naming convention is a high-fidelity necessity for Air Traffic Control to provide precise landing and takeoff clearances, ensuring that multiple aircraft can operate simultaneously without any confusion regarding which specific strip of pavement they are assigned to. Without these suffixes, pilots would have no way to distinguish between parallel surfaces that share the exact same magnetic heading.