What Does 1 UL Mean? Unpacking a Dual-Meaning Acronym
                                
                                
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                                    4 min read                                
                            
                                Globally, millions of products bear a UL mark, yet in science, a 'μL' refers to a millionth of a liter. The meaning of '1 UL' depends entirely on its context, referring either to a precise metric volume or a rigorous product safety certification from Underwriters Laboratories.