guide line

any guide or indication of a future course of action: guidelines on the government's future policy.

a lightly marked line used as a guide, as in composing a drawing, a typed page, or a line of lettering.

a rope or cord that serves to guide one's steps, especially over rocky terrain, through underground passages, etc.

a rope or wire used in guiding the movement of stage scenery or curtains being raised or lowered.