It’s actually worse than just debits before credits. It’s debits in reverse order of amount, then credits. So if you get your paycheck deposited in the morning, stop for gas, pick up a coffee, go shopping, go home and pay your utility bills and rent, they can order it so the rent goes through first, then the bills, shopping, gas and coffee all trigger separate overdrafts, then the paycheck is added last, stealing hundreds of dollars from you when you didn’t spend a cent you didn’t have.
It goes even further than that. After vigintillion, you have steps of 10^30 that go trigintillion, quadragintillion, quinquagintillion, sexagintillion, septuagintillion, octogentillion, nonagentillion and centillion, with the 10^3 prefix in the front. If you really need to ramp up further, centillion can be prefixed by any of the other major prefixes, so 10^30 centillion is a decicentillion, and so on.
It’s a whole system that I had a hyperfixation on as a kid so I remember it quite well.