What is mortarboard?

A mortarboard is a square, flat cap often worn during academic ceremonies, particularly graduations. It typically features a tassel attached to the center, which graduates move from one side to the other as a symbol of their transition from student to graduate. The design is emblematic of scholarly achievement and is commonly associated with higher education institutions. The name "mortarboard" is derived from its resemblance to a tool used by bricklayers.