It's the name of the class that I was in at the college I attended when I first joined Intercot.
All our leavers classes were traditionally called Rhetoric followed by the year in which they leave. The year before that was called Poetry preceded by Syntax and the younger years were called Grammar.
When I signed on here for the first time all my books, photographs, and letters were marked with my name followed by Rhetoric2000, so I just left out my name.