Generally, the propellers on both engines of most conventional twin-engined aircraft spin clockwise (as viewed from the rear of the aircraft).

Counter-rotating propellers generally spin clockwise on the left engine and counter-clockwise on the right.

Each one emits a different tone when spun clockwise or counterclockwise.

For a regular-footed skater (left foot in front) the board spins clockwise from the perspective of a view from behind the skater.

The ride spins clockwise at speeds of up to, dispelling a slight amount of centrifugal force.