The term "Sistine" is not indicative of numerical order; rather, it is derived from Pope Sixtus IV, who commissioned the chapel. The name "Sistine Chapel" originates from the Latin "Capella Sistina," referencing Pope Sixtus IV, who had the chapel built between 1473 and 1481. It is not the 16th chapel in a series but rather a standalone structure within the Apostolic Palace in Vatican City. The chapel serves various ecclesiastical functions, including being the site where papal conclaves are held to elect new popes. The misconception that it is the "16th chapel" likely arises from a misunderstanding of the name, which has nothing to do with numerical sequencing.