First time I heard of rotators and wordcels, but yeah, when I was in high school we were actually given tests to see how much of a rotator or wordcel we really were -- the idea being to make career suggestions based on the results. I did fairly well on the rotator tests, which involved things like telling which way a particular gear or pulley in a given mechanism will turn. I struggled with the wordcel tests, which involved picking out a sequence of letters.

Do you know who ran the board on the wordcel tests? Like, all of the girls.

Just another anecdata point, so don't take it seriously.