At times developers and console manufacturers trademarks some rather strange stuff, and that’s the case of Sony Computer Entertainment, that recently filed for trademarking “Mental Supplement” at the Japanese Patent and Trademark Office.
A hint could be provided by the class, which is 9 (that indicates something related to games), and specifies “electrical connectors, wires, electrical cables and electrical adapter, universal serial bus cables.”
This seems to indicate that we’re looking at something hardware-related, but with trademarks you can never tell.
It sure is a strange name for something related to games, but there you have it. What it really is, your guess is as good as mine. We’ll probably learn about it soon enough.