Period: In trigonometry, the period refers to the length it takes for a periodic function to repeat itself. It can be thought of as the distance between two consecutive revolutions.
Angular Velocity: Angular velocity measures how fast an object rotates around a fixed point. It is usually expressed in radians per second.
Central Angle: A central angle is an angle formed by two radii (lines from the center) of a circle, with its vertex at the center. The measure of this angle corresponds to the fraction of a revolution completed by an object.