A glacier is slow, massive and almost unstoppable, read as change that takes a long time but reshapes everything. Dream books also link it to feelings frozen over many years.
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.