overhead (floats over the unit's head, but doesn't sway with)
head (sways with the unit's animation)
chest (also good for wings)
origin (usually at the base of a unit's feet)
hand
foot
weapon (for heroes)
sprite (for buildings)
medium (for buildings)
large (for buildings)

left
right
mount (for mounted units)
rear (for quadrupeds)
first (for buildings)
second (for buildings)
third (for buildings)
fourth (for buildings)
fifth (for buildings)
sixth (for buildings)
rallypoint (for buildings)