3-Fold Rotation Axis-Objects that repeat themselves upon rotation of 1200 are said to have a 3-fold axis of rotational symmetry (360/120 =3),and they will repeat 3 3 3 times in a 3600 rotation. A filled triangle is used to symbolize the location of 3-fold rotation axis. 4-Fold Rotation Axis -If an object ◆ repeats itself after 900 of rotation,it will repeat 4 times in a 3600 rotation,as illustrated previously.A filled square is used to symbolize the location of 4- fold axis of rotational symmetry. 6-Fold Rotation Axis-If rotation of 600 about an axis causes the object to repeat itself,then it has 6-fold axis 6 6 ● of rotational symmetry (360/60=6). A filled hexagon is used as the symbol for a 6-fold rotation axis.8