Service mark

trademark used to identify a service rather than a tangible good

A service mark or servicemark, is used in some countries as a trademark to identify a service rather than a product.

A fake logo using the service mark symbol.

When a service mark is federally registered, the standard registration symbol ® or "Reg U.S. Pat & TM Off" may be used (the same symbol is used to mark registered trademarks). Before it is registered, it is common practice (with some legal standing) to use the service mark symbol (a superscript SM).