Some RPG's tend to use 'Health' and 'Stamina'.
Health being actual, physical health, and will be quite limited e.g. an average gun does say 4-16 damage, and health is around 10-20. While not perfectly realistic, it means you can survive 2/3 bullets if they hit you in the leg/arm, but will be one-shot killed if you get shot in the head/chest. Even if you aren't one-shotted by the bullet, you'd start taking penalties to your actions as health-damage builds up.
Stamina would represent all the accumulated cuts, scrapes, bruises and 'narrow misses' that are the daily bread of you average, fun-loving hero. In-game, at high level you could have say 100 stamina. So you could easily absorb a bunch of bullets from the enemy cannon fodder because even when they 'hit', you're still diving behind cover, dodging at the last second or whatever, and only getting a 'scrape'.
When Stamina runs out, however... watch out. Even the biggest hero can be worn down by sufficient volumes of cannon-fodder. If you don't have the stamina to absorb the damage, it goes straight to health.
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In other games, you have a similarly limited amount of health, but have the ability to 'absorb' damage instead of having 'Stamina'. This represents things like wearing a bullet proof vest allowing you to ignore small amounts of damage from a .22, and still reducing but not eliminating damage from an assault rifle.