The only nick I know for SAI is, well, SAI.

Which is fine.
Here's one though, for another org, that I H-A-T-E HATE!!!
I HATE WHEN PEOPLE REFER TO A BROTHER OF PHI MU ALPHA AS A "PHI MU"!!! Arg! They're Sinfonians, or Phi Mu Alphas. Period. No offence to Phi Mu, but my Sinfonian boys would look a little silly wearing pink and white.