A mortarboard cap is a flat, square academic cap traditionally worn during graduation ceremonies. It features a stiff, square top and a tassel that hangs from the center. The cap is often made of black fabric, symbolizing formality and academic achievement. The mortarboard is part of the academic regalia, which also includes a gown and hood. This attire is commonly associated with institutions like universities and colleges, marking the transition of students into graduates. The cap's design has historical roots, reflecting centuries of educational tradition and ceremony.