Confused with the jargon used in today’s signage industry? Do terms such as ‘cluster’ ‘contrast ratio’ or ‘refresh rate’ make you scratch your head? This glossary of terminology will help light the way to understanding many of the terms associated with Outdoor Digital Advertising.

To navigate through the glossary, click on the letter above to go directly to that glossary page.

[U]

UL

An abbreviation for Underwriters Laboratories, Inc., a Nationally Recognized Testing Laboratory.

UNDER-CANOPY SIGN

A sign designed to be mounted underneath a canopy.

UNILLUMINATED UNIT

An outdoor unit that has not been equipped with lighting for nighttime illumination of an advertising message. The DEC for an unilluminated unit is calculated using a 12 hour viewing period.

UNIT

Any outdoor advertising display.