Sic!

The term "Psionics" should be followed by "(sic)" in most works dealing with roleplaying game rules, for it is typically misused. (A good indicator of how well the authors have researched their work, and how little the publisher knows about it, too!). Psionics means "electronically enhanced psychic, or psychogenic, ability." It is as simple as that. —Gary Gygax

(Via Grognardia, naturally)