Unregistered trademark: ™ and SM. You may use the ™ on marks identifying tangible goods, and the SM on marks identifying services. Both of these symbols are used to give potential infringers notice that a term, slogan, logo, or other indicator is being claimed as a trademark. They are used for unregistered trademarks. However, including ™ or SM doesn't guarantee that the owner's mark will be protected under trademark laws.
Registered trademark: ®. The ® symbol provides "statutory notice." It can only be used if your trademark is federally registered on either the Principal or Supplemental Registers maintained by the United States Patent and Trademark Office (USPTO). Use of ® with any unregistered trademark can lead to claims of fraud or other obstacles in obtaining and/or enforcing trademark rights.
For extra help on how to copyright or trademark your work, logos, or services, consult an experienced intellectual property lawyer in your area.