The word 'establishing' in a script is usually included in the phrase 'establishing shot'. This shot establishes the location of the ensuing scene. For example, just before a scene in a classroom, the establishing shot of the exterior of the school can be shown.

Establishing Shot

Usually to use for an establishing shot of a setting or in some cases to signify feeling of a situation in distance

The shot at the beginning of a scene that establishes the location and characters is called an establishing shot. It provides context for the audience by showing the overall setting before focusing on specific details.