UL, originally Underwriters Laboratories, tests and certifies products for safety. A UL Listed mark on a commercial refrigerator indicates that representative samples were evaluated against the relevant safety standards, chiefly for electrical and fire hazards, and that the manufacturer is subject to follow-up checks. Different UL marks exist for complete products, components and specific markets, so the exact mark matters.
UL listing is mainly relevant to equipment sold in the United States and Canada, where electrical inspectors and insurers often require it. In India it has no legal standing, and equipment built for North American markets is often designed for different voltage and frequency than India's 230 V, 50 Hz supply. A UL mark is also a safety mark, not a food hygiene certification.
A purchase team at a US-headquartered company setting up a staff cafeteria in Hyderabad might see UL in its global equipment specification. Before buying, it would need to confirm that the specific model is built for Indian power and whether local standards or BIS requirements apply.