It is also called an arrow. In a circle, it is the line that joins the midpoint of an arc , with the straight line that cuts its ends. It is a term used in geometry. The word is of Latin origin and means arrow.
In geometry, it is the distance between the midpoint of an arc of circumference and the midpoint of the line that limits it. From the Latin sagitta, ae ("arrow"). The arrow or sagitate is also used in architecture.