SDCL § 47-11-2: Corporate name.

A corporate name shall end with the word "chartered," or, the word "limited," or the abbreviation "Ltd.," or the words "professional association," or the abbreviation "P.C." or "PC". Corporations that were utilizing the designation "P.A." on July 1, 1974, but no others, may continue to use that designation. A limited liability company name shall include the word "professional limited liability company" or the abbreviation "Prof. L.L.C.", "Prof. LLC", "P.L.L.C.", or "PLLC".