Warbanners are the flags that identify an individual dark Jedi on the field of battle. The design, color, stripes, and charge of the Warbanner help to identify individuals, while medallions Identify those of leadership positions in the various clans.
The warbanner of a Guardian (the lowest rank in the brotherhood that is able to request a warbanner) will be much less ornate than those of higher ranks. As one progresses through the ranks, more and more different styles become available.
For a complete listing of the different options by rank, click [1]