The average PCB manufacturer in North America has annual revenues of <US$10M.

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Glossary of terms

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Term Definition
UL (Underwriter’s Laboratory Inc.)   An independent not-for-profit organisation, set up by the insurance industry for the purpose of establishing product safety standards, that evaluates and certifies the performance and safety of electrical equipment, components and materials.
UL Symbol   A logotype denoting that a product has been recognized (accepted) by Underwriters Laboratories Inc. (UL).
ultra-fine-pitch   As with fine-pitch, a term whose value depends on the date of the definition. The term now (arguably) applies to surface mount packages with a centre-to-centre lead distance of 0.4mm (0.016in) or less.
undercut   A phenomenon identified in the PCB manufacturing process whereby the base metal of the PCB is narrowed relative to the overlay of photoresist or electroplated copper
unsupported hole   A hole in a printed board containing no plating or other type of conductive reinforcement.
UUT (Unit under test)   A term applied to any component or assembly being tested by automatic testing equipment.
UV Curing   Polymerizing, hardening, or cross linking a low molecular weight resinous material in a wet coating ink using ultra violet light as an energy source.