Academic caps have been a symbol of graduation and achievement for centuries. The traditional name for this event cap is mortarboard, which is due to its resemblance to the tool used by bricklayers to carry supplies. However, there are various alternative names for this cap. One of the most common synonyms for a mortarboard is a graduate cap. Another popular term is a square academic cap since it is square-shaped with four corners. Some people also refer to it as a doctoral cap or a PhD cap, as it is often worn by graduates receiving doctoral degrees. Regardless of the name, the academic cap is a symbol of achievement and distinction.