1209.1 Content of Notice
To serve as prima facie evidence of notice of protection, the form of the notice shall consist of:
• The words “mask work,” the symbol *M*, or ‚Ⓜ (the letter M in a circle); and
• The name of the owner(s) of the rights in the mask work or an abbreviation by which the name is recognized or generally known.
17 U.S.C. § 909 (B).