An investment stands for putting something in now in hope of growth later. Tradition reads it as commitment, to a person, a project or yourself, and the uncertainty that goes with it.
Has this come up in your dreams before? What was going on in your life then?
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.