einfachbier,
From The Oxford Companion to Beer
a now antiquated German federal beer tax category that was abolished effective January 1, 1993. Literally, the term meant “simple beer” and referred to a beer with an original gravity—measured in degrees Plato—of 2°P to 5.5°P.
This definition is from The Oxford Companion to Beer, edited by Garrett Oliver. © Oxford University Press 2012.