The Royal Cubit is an ancient unit of measurement used in Egypt, primarily for construction and architecture. It is believed to be based on the length of the forearm from the elbow to the tip of the middle finger, measuring approximately 52.3 centimeters (20.6 inches). This measurement was crucial in the building of monumental structures, including the Pyramids of Giza. The Royal Cubit was often divided into smaller units, such as the cubit and the handbreadth, allowing for precise measurements in various projects. Its standardization helped ensure consistency in the construction of temples, tombs, and other significant buildings throughout ancient Egypt.