Hit points or hp is the health of a player character, usually determined by the stat constitution. Damage due to blows by weapons, offensive spells, or even hunger, will diminish hit points, the passage of time will usually regenerate hit points. Usually, hit points below zero result in death of the player character.
Due to the frequency of combat hit points are usually displayed in the prompt which displays frequently, sometimes when any change occurs, but always when enter is pressed.