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 unit was crucial in the design and building of monumental structures, including the famous Pyramids of Giza. In addition to its practical use, the royal cubit was often divided into smaller units, such as the cubit and the palm. The standardization of the royal cubit allowed for consistency in construction, ensuring that buildings and monuments were built to precise dimensions, reflecting the advanced engineering skills of ancient Egyptian society.