The (R) stands for Regional, because the program used to involve high school students from Illinois, Wisconsin, and Michigan. However, the state of Michigan forced the program to de-regional-ize (just made that up), thus the R is in parentheses for those of us who remember the good old days. The (R) also stands for Rawesome, and once they dropped it the program went down the gutter.
Elliott: What's that?
Clarissa: It's summer school for smart kids.
Elliott: Doubt I could go then.