"Stacking functions - In permaculture we speak about getting many yields (outputs) from one element (thing) in your system.
For example, a tree might be an element in your system. A tree can provide shade, shelter wildlife, produce mulch and building materials, be a wind break, fertilize the soil, prevent erosion, raise the water table, etc. A tree can do a lot of different work for us in our system, and that's what we mean by stacking functions." - Permaculture Principles
