Oh shit!

It's a design science that utilizes appropriate technologies and a deep understanding of natural systems to build permanent agricultural systems that delivers food, fuel, fiber, and medicines for humans on an ongoing basis.

This is the bible from the man himself: Bill Mollison.

https://pdfcoffee.com/permaculture-a-designers-manual-bill-mollison-pdf-free.html

A permanent culture, that can sustain itself. Perhaps the opposite of a fiat culture.