(Underwriters' Laboratories) An independent testing agency that checks electrical devices and other components for possible safety hazards. Found on http://www.homebuildingmanual.com/Glossary.htm
UL: 1. Upper lid (of the eye). 2. Upper limit. No evidence was found for chronic excess intakes of potassium in apparently health individuals and therefore no UL was established for potassium. Found on http://www.medterms.com/script/main/art.asp?articlekey=33656
Underwriters Laboratories Inc (UL) is an independent, not-for-profit product safety testing and certification organization based in the USA. UL marking indicates that the product conforms with the safety standards laid down by Underwriters Laboratories.
Found on http://www.mpoweruk.com/glossary.htm
Underwriters Laboratories, Inc. An independent laboratory that establishes standards for commercial and industrial products. Found on https://www.encyclo.co.uk/local/20850
Underwriters' Laboratories (used esp. on labels for electrical appliances approved by this nonprofit safety-testing organization). Found on https://www.infoplease.com/dictionary/ul