Nestor

In Cardassian judicial proceedings, a nestor was an officer of the Cardassian court, and acted as an advisor for the accused. Under the rules of Cardassian judicial procedure, the nestor was not allowed to address the court. 

In 2370, Constable Odo (who had, years ago, been certified as an officer of the Cardassian court system) acted as nestor to Chief Miles O'Brien during O'Brien's trial on Cardassia Prime for collaborating with the Maquis. Odo attempted to address the court several times, despite the prohibition against doing so, much to the anger of Makbar.