Meaning of UL in English

UL /ˌjuː ˈel/ BrE AmE abbreviation for

Underwriters' Laboratories; a US organization which tests the safety of electrical equipment, tools, and drinking water. It makes rules for the companies that produce them. Electrical equipment that is approved by the UL has a special ↑ seal (=mark) on it.

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.