I had lunch in a restaurant today that specializes in serving many kinds
of tea. The list included many varieties that were marked "O.P". We
asked the waitress what "O.P." meant and she said it meant high quality
tea, but didn't know what the letters stood for.

A little web searching this afternoon found the explanation
(http://en.wikipedia.org/wiki/Orange_Pekoe), but I'm still a little
confused about something. The chart lists a bunch of grades, with OP
being the lowest of them. So what were all the teas that didn't have OP
(or any letters) next to their name? Does that mean they're such a low
grade they don't even rate the lowest rating?