What is the collective noun for a group of sheets?

There isn't a widely accepted collective noun for a group of sheets.

However, here are some options you could use, depending on the context:

Creative:

* A stack of sheets

* A bundle of sheets

* A pile of sheets

* A set of sheets

More formal:

* A collection of sheets

* An assortment of sheets

Ultimately, the best collective noun depends on the specific situation and what you want to convey.