Nestor

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

In 2370, Constable Odo acted as nestor to Chief Miles O'Brien during his trial on Cardassia Prime for collaborating with the Maquis.