Orange square with a white minus = someone we hate .. you CANNOT shoot him in high sec
Red square with a white minus = someone we hate A LOT!! .. you CANNOT shoot him in high sec
Red square with a white skull = someone that is an outlaw.... you CAN shoot him ... IF you can take him on.
Red square with a white star = someone that is a wartarget to you.... you CAN shoot him ... IF you can take him on.
Light or dark Blue square with a white plus = someone we're friendly with .. DONT shoot them
Dark square with a white star = someone in your alliance.

http://i.imgur.com/yhlXp.jpg

Drone combat anomolies: Cluster-collection-assembly-gathering-surveillance-menagerie-herd-squad-patrol-horde