This is the finger that points, so it is read as direction, blame or a call for attention. Being pointed at in a dream often mirrors a fear of being singled out.
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.