used to identify a service
rather than a product
is sometimes called a service mark
. They are frequently used by industrial standards bodies
or certification companies to show "approval" of another product in some way. For example, Underwriters Laboratories
holds a service mark on the phrase "UL Listed," and allows manufacturers of electrical equipment to use the service mark only if they have been approved by UL. This lets consumers identify products that meet quality criteria set by a company other than the manufacturer.
See also : marketing, service