A
service mark or
servicemark is a
trademark used in the
United States and several other countries to identify a
service rather than a
product. 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).