Termination Currency - ISDA Provision
Commentary
Compare and contrast with the Base Currency in the CSA. Ideally, you’d want them to be the same.
Note that the 2002 ISDA defaults to EUR or USD (depending on governing law) where not otherwise specified. This means a 2002 version LFC does not need to specify a Termination Currency. Not that you’d ever use a long form confirmation, of course.
The Termination Currency concept can be applied to the termination and closeout of single Transactions or groups of Transactions, so it does make sense for it to be "a currency in which payments are due to be made under the relevant Terminated Transaction" - or some such thing.