NV2
From Wikipedia of the Dark Brotherhood, an online Star Wars Club
Apprentice is the first rank in the Dark Brotherhood. It is given to members who have passed the Test of Lore and gotten placed in a House. Apprentice is also a more general term that refers to any member under the rank of Dark Jedi Knight who has been taken for training by a sanctioned Master in the Master-Student Program.
Most often when you hear someone refer to an Apprentice they are speaking of the Master-Student Program conotation of the term.
