This is the UL certification mark:

For different types of UL services, UL marks can be divided into three categories, namely listing, classification and recognition marks.

1. Listed. Use only on complete products and components or installations that have been replaced or installed in the field by qualified personnel. Products belonging to UL listing services include: IT equipment, AV equipment, refrigerators, vacuum cleaners and other electrical equipment. If the final product needs to be marked with the UL Listing Mark, the sample should be tested by UL to confirm that it is free of fire and electrical hazards.

2. Recognized. Approval is mainly a safety certification for components and materials. Components recognized by the accreditation service will be assembled into finished products, and components must meet relevant licensing conditions before they can be used in corresponding finished products. For example: switches, power supplies, printed boards, transformers, wires, plugs, and plastic materials are all approved objects.

3. Classified. UL's classification service is a safety certification program that evaluates hazards and other special properties of products used in commercial or industrial environments based on relevant laws and regulations. Grading services are mainly targeted at building materials, various fire protection equipment and navigation equipment.

The three logos are used on products with three different services respectively and cannot be mixed, otherwise they may be considered counterfeit products. UL's services are not only based on American UL standards, but also based on Canadian standards (cUL). Therefore, the UL mark is also divided into three types: UL products, cUL products, and both.

(See Baidu Encyclopedia: UL certification mark)