Yahoo! Sports Fantasy NBA uses the following positional breakdowns:

Pos What it Means Who is Eligible
PG Point Guard Any point guard or guard
SG Shooting Guard Any shooting guard, guard, or guard/forward
G Guard Any point guard, shooting guard, guard, or guard/forward
SF Small Forward Any small forward, forward, or guard/forward
PF Power Forward Any power forward, forward, or forward/center
F Forward Any small forward, power forward, forward, guard/forward, or forward/center
C Center Any center or forward/center
Util Utility Any player
IL Injured List Any player on the real-life IL