Proscenium -The metaphorical vertical plane of space in a theatre, usually surrounded on the top and sides by a physical proscenium arch (whether or not truly "arched") and on the bottom by the stage floor itself, which serves as the frame into which the audience observes from a more or less unified angle the events taking place upon the stage during a theatrical performance. Thrust Stage-A thrust stage (also known as a platform stage or open stage)[1] is one that extends into the audience on three sides and is connected to the backstage area by its upstage end. A thrust has the benefit of greater intimacy between performers and the audience than a proscenium, while retaining the utility of a backstage area. Arena Stage-A stage surrounded or nearly surrounded by the audience. Forced Perspective-Forced perspective is a technique which employs optical illusion to make an object appear farther away, closer, larger or smaller than it actually is. It manipulates human visual perception through the use of scaled objects and the correlation between them and the vantage point of the spectator. Raked Stage- Stage floor angled from the edge of the stage, near the audience, up toward the back of the stage, furthest from the audience. This angled position of the stage prompted the use of the terms "upstage," "center stage," and "downstage," which are still in use today. Drop - A "drop" is a piece of scenery used in film and theatre to establish the location of a scene. Usually a drop is a large piece of fabric that has an image on it and hangs in the background. Wings - Either of the unseen backstage areas on the sides of the stage of a proscenium theater. Apron - The apron is any part of the stage that extends past the proscenium arch and into the audience or seating area. Boarders - A curtain used to define the top limit of the stage and to mask or hide lights and unused scenery and curtains. Legs - Legs are tall, narrow stage drapes that are parallel to the proscenium and used to mask the wings on either side of the stage. Trap - A concealed opening, usually in the stage floor, through which actors, props, and scenery can be brought on and off stage. Traps are used, often with elaborate and ingenious machinery, to create a great variety of stage effects, particularly the sudden appearance, disappearance, or apparent transformation of characters or objects on the stage. Turntable - A revolving stage or stage piece. Orchestra Pit - The area in a theater (usually located in a lowered area in front of the stage) in which musicians perform. Cyclorama (Cyc)- A cyclorama is a large curtain or wall, often concave, positioned upstage most part of the stage. Scrim - A piece of gauze cloth that appears opaque until lit from behind, used as a screen or backdrop. Dead Hang- A rigging point direct to the grid / beams above the stage, not to a flying bar. A static suspension. Plaster line- The plaster line runs across the stage at the back face (upstage face) of the proscenium wall. Tab - Drapes that hang at the sides of the stage perpendicular to the proscenium opening to mask the wings. Travaler - The most common type of curtain used in theaters. Traveler curtains remain at a fixed elevation and open and close horizontally, breaking in the middle. The curtains are typically made of Valour and and have a series of vertical box pleats along the top edge. Grand drape - The front curtain, which is variously called a grand drape, act curtain, house curtain, house drape, main drape, hangs downstage, just behind the proscenium arch. It is typically opened and closed during performances to reveal or conceal the stage and scenery from the audience. Wagon - A mobile platform that is used to support and transport movable, three-dimensional theatrical scenery on a theater stage. In most cases, the scenery is constructed on top of the wagon such that the wagon, and the scenery it supports, forms a single, integrated structure. Heavy duty casters are mounted to the underside of the platform so that the entire assembly can be quickly moved onstage or offstage, so as to facilitate rapid scenery changes during live productions. Flat - A flat (short for scenery flat) is a flat piece of theatrical scenery which is painted and positioned on stage so as to give the appearance of buildings or other background. Flats can be soft covered (covered with cloth such as muslin) or hard covered (covered with decorative plywood such as luan). Fly space - The large volume above the stage into which line set battens are flown, along with whatever loads they may be carrying. In a full-size fly space, the tower height is ideally at least 2.5 times the height of the proscenium. This allows a full-height curtain or set piece to be located completely out of view of the audience .

Proscenium -The metaphorical vertical plane of space in a theatre, usually surrounded on the top and sides by a physical proscenium arch (whether or not truly "arched") and on the bottom by the stage floor itself, which serves as the frame into which the audience observes from a more or less unified angle the events taking place upon the stage during a theatrical performance.

Thrust Stage-A thrust stage (also known as a platform stage or open stage)[1] is one that extends into the audience on three sides and is connected to the backstage area by its upstage end. A thrust has the benefit of greater intimacy between performers and the audience than a proscenium, while retaining the utility of a backstage area.

Arena Stage-A stage surrounded or nearly surrounded by the audience.

Forced Perspective-Forced perspective is a technique which employs optical illusion to make an object appear farther away, closer, larger or smaller than it actually is. It manipulates human visual perception through the use of scaled objects and the correlation between them and the vantage point of the spectator.

Raked Stage- Stage floor angled from the edge of the stage, near the audience, up toward the back of the stage, furthest from the audience. This angled position of the stage prompted the use of the terms "upstage," "center stage," and "downstage," which are still in use today.

Drop - A "drop" is a piece of scenery used in film and theatre to establish the location of a scene. Usually a drop is a large piece of fabric that has an image on it and hangs in the background.

Wings - Either of the unseen backstage areas on the sides of the stage of a proscenium theater.

Apron - The apron is any part of the stage that extends past the proscenium arch and into the audience or seating area.

Boarders - A curtain used to define the top limit of the stage and to mask or hide lights and unused scenery and curtains.

Legs - Legs are tall, narrow stage drapes that are parallel to the proscenium and used to mask the wings on either side of the stage.

Trap - A concealed opening, usually in the stage floor, through which actors, props, and scenery can be brought on and off stage. Traps are used, often with elaborate and ingenious machinery, to create a great variety of stage effects, particularly the sudden appearance, disappearance, or apparent transformation of characters or objects on the stage.

Turntable - A revolving stage or stage piece.

Orchestra Pit - The area in a theater (usually located in a lowered area in front of the stage) in which musicians perform.

Cyclorama (Cyc)- A cyclorama is a large curtain or wall, often concave, positioned upstage most part of the stage.

Scrim - A piece of gauze cloth that appears opaque until lit from behind, used as a screen or backdrop.

Dead Hang- A rigging point direct to the grid / beams above the stage, not to a flying bar. A static suspension.

Plaster line- The plaster line runs across the stage at the back face (upstage face) of the proscenium wall.

Tab - Drapes that hang at the sides of the stage perpendicular to the proscenium opening to mask the wings.

Travaler - The most common type of curtain used in theaters. Traveler curtains remain at a fixed elevation and open and close horizontally, breaking in the middle. The curtains are typically made of Valour and and have a series of vertical box pleats along the top edge.

Grand drape - The front curtain, which is variously called a grand drape, act curtain, house curtain, house drape, main drape, hangs downstage, just behind the proscenium arch. It is typically opened and closed during performances to reveal or conceal the stage and scenery from the audience.

Wagon - A mobile platform that is used to support and transport movable, three-dimensional theatrical scenery on a theater stage. In most cases, the scenery is constructed on top of the wagon such that the wagon, and the scenery it supports, forms a single, integrated structure. Heavy duty casters are mounted to the underside of the platform so that the entire assembly can be quickly moved onstage or offstage, so as to facilitate rapid scenery changes during live productions.

Flat - A flat (short for scenery flat) is a flat piece of theatrical scenery which is painted and positioned on stage so as to give the appearance of buildings or other background. Flats can be soft covered (covered with cloth such as muslin) or hard covered (covered with decorative plywood such as luan).

Fly space - The large volume above the stage into which line set battens are flown, along with whatever loads they may be carrying. In a full-size fly space, the tower height is ideally at least 2.5 times the height of the proscenium. This allows a full-height curtain or set piece to be located completely out of view of the audience .