It is pressed from Spanish and north-west African acorns, rather than the bitter ones in Europe and North America. Some wild-eyed acorn enthusiasts think that Acorn Oil might be the next big thing.
It is made and used in Algeria and Morocco, and made to some small extent in Spain.
This is not the same thing as the distilled acorn oil sold in North America to hunters to use to mask their human scent with.
Indians in eastern North America pressed it from the more bitter acorns found in North America.