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Ground Sign: A freestanding sign with no visible support structure.



H Channel Letter: A dimensional letter with baffles at the center of the cross-sectional shape for support of neon tubing and mounting of transformers.

High-Rise Sign: A tall freestanding sign, usually of pole design and construction.



Incandescent Bulb: A lamp that produces light through the application of electrical energy to a wire filament, which glows as it is heated. Its application is limited because it is a point source light, not easily diffused. It generates considerable heat, and its life span is limited by the filament degradation factor. Unlike neon tubing, it can be mass produced. (See fluorescent lamp; neon sign.)

Interior Signs: Signs that are located inside a building or other facility.

Illuminated Sign: A sign with electrical equipment installed for illumination at night or in early morning darkness, either internally illuminated through its sign face by a light source contained inside the sign or externally illuminated by reflection of a light source aimed at its surface.

ISA: International Sign Association. Trade association representing manufacturers, installers, users, and suppliers of on-premise signs and products. Located in Alexandria, VA.

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Fascia Sign: A building-mounted sign.

Flat Cut-Out Letter: A dimensional letter cut from sheet or plate stock.

Freestanding Sign: A sign that is not attached to a building.

Front-Lighted Letter: An illuminated channel letter with a translucent face.

Full-Service Sign Companies: Sign companies that complete the entire signage project, including site survey and sign design, engineering, manufacture, permitting, installation, and maintenance. (AKA... Insignia!)

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Electronic Message Center: A variable-message sign that utilizes computer-generated messages or some other electronic means of changing copy. These signs include displays using incandescent lamps, LEDs, LCDs, or a flipper matrix.

Embellishments: Letters, graphics, mechanical devices, fiberoptics, lighting, cutouts, extensions, structure coverings, vicinity landscaping, or any other special-effect addition to a sign that will enhance its appearance and ability to effectively communicate its message.

Extensions: The area of design made as a cutout that extends beyond the basic rectangular space of a sign face or message.

Exterior Illuminated Sign: A sign that is illuminated by a light source that is directed towards and shines on the face of a sign; also called direct illumination.

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Daily Effective Circulation (DEC): The average number of daily potential exposures to a display or group of signs. DEC is determined by counting only those vehicles traveling toward the face of the sign and then multiplying that number by the average number of people per car during the hours the sign is visible. Pedestrian and mass-transit circulations are not included. This is the basic measure in establishing cost-per-thousand exposures on signs. The basic traffic numbers can usually be obtained from state departments of transportation.

Dimensional Letter: A cut-out, cast, fabricated, or molded material such as metal or plastic, in the shape of a letter, logo, or symbol.

Directory Sign: A sign that identifies the names and locations of tenants in a multi-tenant building or in a development made up of a group of buildings.

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Cabinet Sign: A sign structure consisting of the frame and face(s), not including the internal components, embellishments, or support structure.

Changeable-Copy Sign: A sign or portion thereof on which the copy or symbols change either automatically through electrical or electronic means (for example, time and temperature units), or manually through placement of letters or symbols on a panel mounted in or on a track system.

Channel Letter: A fabricated or formed three-dimensional letter that may accommodate a light source.

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Backlighted Letter: An illuminated reverse channel letter with an open or translucent back so that light from the letter is directed against the surface behind the letter, producing a halo lighting effect around the letter; also referred to as silhouette- or halo-lighted.

Ballast: An electrical device required for operating fluorescent lamps.

Banner: A temporary sign of lightweight fabric or similar material that is mounted to a pole or a building. Promotional banners include those used to announce open houses or grand openings, or to advertise special events. Ornamental banners use images or colors of a decorative nature.

Bench Sign: A sign located on the seat or back of a bench or seat placed on or adjacent to a public right-of-way; a type of street furniture.

Billboard: A large, standardized third-party/off-premise structure displaying advertising intended for viewing from extended distances, generally more than 50 feet. Billboard/outdoor advertising displays include, but are not limited to, bulletins, wall murals, wrapped posters, 30-sheet posters, and eight-sheet posters.