Arrangement of cameras.
First letter is plans: C. - close-up or big plan (face or face with shoulders), M. - middle plan (main part or half of man or others objects), F. - full plan (screen has completely one object), G. - general plan (screen has all place of action or completely some objects). Second letter is angle of shooting relatively front of object (N (north) - shooting in front, S (south) - shooting in back, NW camera in north-west, N-W - camera moves from north in west). Next number is angle of inclination relatively horizon (minus - shooting from below, two minus - camera movies for shooting from below). Last letter with number are number of camera on picture.