Am I tripping or did the wiki use to have a page for the concept of invincibility frames (or "iframes")? The term describes a brief period of time in many video games during which you're immune to most obstacles, typically caused by taking damage or spawning. Often this is visually indicated by your character flashing repeatedly or taking on a red hue.
Not only is this a significant gameplay aspect in Mario games, it may even display additional qualities specific to a Mario game: for instance, in Mario Kart Tour, if you bump into an obstacle immediately after you've crashed (and have thus triggered the iframes), you get points from said obstacle as if you used an item on it, something that doesn't happen if you run into the obstacle normally. I believe the concept definitely merits a page, and if it did have a page at some point, I'd be interested in seeing the discussion that led to its removal.