A UL mark has 4 elements, as seen in the picture:

UL Mark

1. The letters “UL” are in a circle, a bold (thick) circle and are staggered
2. The word “Listed” appears under the circle whereas the word “Classified is wrapped around the top of the circle
3. The product identity is listed
4. An issue or control number (a four-digit alphanumerical or longer code)

Additionally, the overall diameter of the UL mark should not exceed 3/8′ of an inch. The font for all letters is Helvetica Condensed Black except for the registered trademark symbol (®). Do not purchase products with a UL mark that uses another font as they are counterfeited.

For more information on how to identify counterfeit UL marks, click here

For more detailed information regarding UL certification marks in general, please visit their site: www.ul.com

Underwriters Laboratories welcomes report of of any misuse of their UL marks at the following address: www.ul.com/ahjreport

The list of approved UL centers are listed on this page http://www.ul.com/global/eng/pages/corporate/aboutul/ulmarks/centers/

I hope your found this article about UL marks helpful and relevant to your line of work. Please feel free to share it with your networks, and peers. Let’s propagate the good words and education to keep American Products safe  and coming on our markets.