What is the collective noun for currency notes?

There isn't a widely accepted, specific collective noun for currency notes.

You could use more general terms, like:

* Bundle

* Stack

* Pile

* Heap

For a more specific and descriptive approach, you could use phrases like:

* A wad of cash

* A sheaf of bills

* A roll of currency

Ultimately, the best choice depends on the context and the intended effect.