Me. Rev. Stat. tit. 31, § 6

No person or persons, partnership or other entity engaged in any business, except a corporation, may adopt a name for such business that contains the words "corporation," "incorporated" or "limited," or any abbreviation of any such words. A limited partnership may use the term "limited partnership" as part of its name, a limited liability company may use the term "limited liability company" as part of its name and a limited liability partnership may use the term "limited liability partnership" as part of its name.