A rocket stands for fast progress, ambition and a burst of drive that lifts you off the ground. A launch is read as a bold beginning; a failed one as fear about overreaching.
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.