Heroes Unlimited uses 8 basic stats rolled on a 3d6 basis. Any score with a "natural" roll of 16,17, or 18 gets to add an additional 1d6 to the stat.

Stats are:
IQ (intelligence) affects skill %
ME (Mental Endurance) helps with saves and psionics
MA (Mental Affinity) a leadership type stat
PS (Physical Strength) Muscles or lack thereof
PP (Physical Prowess) Dexterity
PE (Physical Endurance) Constitution affects saves and hit points/health
PB (Physical Beauty) Comeliness
SPD (Speed) running speed

The stats can be changed using skills and powers coming later.