Hit Points

From SmashWiki, the Super Smash Bros. wiki

Hit Points (also known for simplicity as "HP") is the basic unit of health in the Stamina modes of the Super Smash Bros. Melee and Brawl. When a character is hit by an opponent's attack, their Hit Points decrease. The character can continue as normal until their Hit Points are reduced to 0, when they are knocked out. The health of two recurring bosses in the Super Smash Bros. series, Master Hand and Crazy Hand, are always measured in Hit Points, unless otherwise altered by an Action Replay.