Max HP — Maximum Hit Points
The most health a character or creature can have when fully healed.
Maximum Hit Points (Max HP) is the full amount of Hit Points (HP) when unhurt. Healing cannot go above it. It usually grows as a character gains levels. The Game Master (GM) can set it by hand.
In Fantasy RPG
Fantasy RPG works it out from the class hit die and the Constitution modifier: the full hit die plus Constitution at level 1, then half the die + 1 plus Constitution for each level after. The GM can set a different maximum.