Camera left

Also known as screen left. It is used in post-production to communicate where something is on screen, especially in reference to actors or characters. An example of this would be this feedback note: "Let's change out the watch on his left wrist." The director might be referring to the character's left hand which is on the right of the screen or it could be the hand on the left of the screen. They are two different things. By specifying with "screen left" or "camera left," it is clear where the note is referring to.