Oddball

From BaseballCardPedia.com

Oddball: Anything that is either a) not part of a mainstream base set nor b) a pre-1989 insert. Most things that come under this definition are food issues (1970s era Burger King), regional issues, team issues, police sets, test issues, non-traditional card-like items (1989 Topps Heads Ups), redemption issues (80s era Topps Glossies), or things that came in packs but before inserts became what they are today (1965 Topps Embossed and their ilk).