I live in Canada, and I watch Coronation Street.

They use the word "rotor" on the show to refer to work schedules (which to me is part of a car)

Is this word related to "roster"? If so, how did "roster" become "rotor"?

Thanks!

ETA: Sometimes I turn on the closed captioning, but I think it wouldn't have helped in this case with spelling; I am pretty sure Canadians are doing the closed captioning based on what I have seen in the past.