[Flac] Standard encoding rates?

[Hal Vaughan]

Is there a list somewhere of "standard" encoding rates?  I know, for example, 
CDs are encoded at 44100, as is a lot of digital sound, but I've seen 
programs that specify different levels of quality (like radio, phone, tape, 
CD) and I'd like to know if there are some encoding rates that are accepted 
as standardized for recording at different levels of quality.

If so, is there some place I can get a list of them?

Thanks!

Hal