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UL
An abbreviation for Underwriters Laboratories, Inc., a Nationally Recognized
Testing Laboratory.
Under-Canopy Sign
A sign designed to be mounted underneath a canopy.
Ultraviolet Light (UV)
UV has both a negative and positive influence on the sign industry. When UV
strikes certain surfaces, such as the phosphors in neon and fluorescent
tubes, it is transformed into visible light. UV is also used for curing
some screen printing inks. On the other hand, ultraviolet light is the prime
cause of pigment failure (fading) in some paints and vinyls, especially
red ones.
Upper Case Letter
Capital letter in an alphabet.
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