overhead - a bit overhead of the unit
head - the head of the unit
chest - the chest of the unit
hand, right - the right hand of the unit
hand, left - the left hand of the unit
weapon - the weapon of the unit (Here you can also use [weapon,left & weapon,right] but that may not work always.)
origin - The place on the ground of the unit. Example, where the aura models are located on the unit.