Delta Sigma Rho was an honorary forensics group, merged with Tau Kappa Alpha.....
It a forensic fraternity
http://www.mnsu.edu/cmst/dsr-tka/dsr-tka.html
That's the only national group I'm familiar with. There may be a local by that name.
Delta sigma rho key:
There was also a group founded at Miami university called Sigma Delta Rho, defunct now...merged with Pi Kappa Phi, and Alpha Kappa Pi (which this group ended up merging with Alpha Sigma Phi)
Does this help?