Shiny and protective, aluminium foil is read as wrapping something to keep it fresh or warm. It can also stand for a reflective surface that hides what lies inside.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.