Raceway - Metal or insulated rubber tubing used to channel electrical wires.

Rail - A low wall used to divide exhibits.

Rear Illumination - A technique of using a light source to illuminate a translucent image from behind. Also called Back-lighting.

Rear Projection - A video technique in which images are projected on a screen positioned between the projector and the audience.

Refurbish - The process of repairing or reconditioning an exhibit to extend its life span.

Relay - An electrical device used to produce programmed effects by interrupting the flow of current.

Release Forms - Forms provided by show management to permit the removal of materials from an exhibition.

Rental Booth - A complete booth package offered to exhibitors on a rental basis.

Return Panels - Side panels joined perpendicular to the backwall.

Rheostat - A device used to regulate lighting intensity. Also known as Dimmer Switch.

Rigger - A skilled worker responsible for handling and assembly of machinery.

Right To Work State - A state where no person can be denied the right to work because of membership or non-membership in a labor union.

Riser - A platform for people or materials.