I think you are talking about moving balances between cards, sometimes called floating. It might loosely be arbitrage if you use the cash back features to think

I think you are talking about moving balances between cards, sometimes called floating. It might loosely be arbitrage if you use the cash back features to think of the value of a dollar spent on one card being less than the other. If 3% cash back, spending one dollar on the card really only costs 97% of one dollar, then pay it off with a normal 0% cash back card.