[bradknowles]

It’s actually “TAN” lists, and based on an initial skim of this page, I’m assuming this is an acronym of some sort for a type of one-time use passwords.

Perhaps one of our readers from Germany can help us clarify?

[timakro]

It stands for "Transaction authentication number", in Germany this term is widely used, not sure about other European countries.

And yes you are correct, this is a one-time password you enter to authenticate a bank transaction.