Most commonly written “i-frames” or “iframes”, this refers to a set of animation frames where the player character is invincible to damage. Usually in the context of a dodge move. Generally discussed with a number of frames and the amount of seconds the mechanic affords. A good example is the dodge roll in the Dark Souls series, which gives a very short window of opportunity for the player to escape damage. Relatively few survivors-likes have iframes, but ones with dodge buttons often have an option to improve the dodge ability to avoid damage.