There was a subculture communicating on FIDOnet about collecting AOL installation media (3.5" disks) and reusing them. Somehow we ended up coining the term "bisk" to refer to AOL's given-away media, and much sadness was had when they moved to CDs.
So add one more to the list: a commercial disk reused for your custom .WAD files can be a bisk.
So add one more to the list: a commercial disk reused for your custom .WAD files can be a bisk.