Dolphin is a play on a whale, a medium spender vs a big spender or a free-to-play (F2P) user. I don't know where i-frames came from originally, but it's abbrev

Dolphin is a play on a whale, a medium spender vs a big spender or a free-to-play (F2P) user. I don't know where i-frames came from originally, but it's abbreviated from invincibility frames, and is usually the part of an animation where your character won't take damage. I think Dark Souls/Elden Ring would be the most well known example of that mechanics.