When I was in school, we only used apostrophe, comma, open and close paren, exclamation point, question mark, dollar sign, and period. Maybe a percent sign in later years. Of course my exposure to computers in those days was watching TV when the announcer took a stack of (punch) cards from a card sorter and called it a computer (UNIVAC IIRC).
Chevrons are designations of "rank" not rating. The US navy used the term rating but not to denote rank or at least not to denote ranks in general. I think a "rating" was a inexperienced person.
