Yes, you can trademark greek letters.
You can trademark a Greek letter if you are using it to promote or sell your products or services. If you are using greek letters as your slogan or product names then they qualify for all of the protection that a trademark grants. Greek letters are considered public domain in the same way that the English alphabet is, which is to say that the alphabet can be appropriated to create slogans and names without inherently risking infringement.
Most sororities and fraternities own trademarks for the Greek letters that comprise their name, as such there are a large number of registered trademarks that use Greek letters. If you would like to use Greek letters to identify your products then you should have a thorough trademark search performed to ensure that there are no conflicting trademarks for the specific letters that you intend to use. A fraternity owning a trademark will not necessarily prevent you from using it, so long as you are not infringing upon the market that the trademark is associated with.
Contact us today to speak with our associates about securing a trademark for a logo that uses Greek lettering.