Final answer:
The angular speed about the polar axis is termed angular velocity, describing the rate of rotation in radians per second, and is the rotational analog of linear velocity.
Step-by-step explanation:
The angular speed about the polar axis is known as the angular velocity. Angular velocity is the rotational equivalent of linear velocity and it's quantified as the rate at which an object rotates around an axis, measured in radians per second (rad/s). In contrast, tangential velocity is the instantaneous linear velocity of an object in rotational motion, and it is proportional to the angular velocity multiplied by the radius (v = rω). Angular acceleration, on the other hand, is the rate at which the angular velocity changes over time.