The graduation hat is known by several names, including the square academic cap, graduate cap, cap, mortarboard, or Oxford cap. It is part of the formal academic attire to be worn by graduating students during the graduation ceremony. The cap consists of a horizontal square board fixed upon a skull-cap, with a tassel attached to the center. In the UK and the US, it is commonly referred to informally in conjunction with an academic gown as a "cap and gown". It is also sometimes termed a square, trencher, or corner-cap. The pointed tip of the cap is meant to go in the front of the head while the elastic band sits on the back of the head. The cap should be worn flat on the head and not tilted back, and it should lie about one inch above the eyebrows.