An X can mark a spot, cross something out or seal a letter with a kiss. Dream books read it as something being found, cancelled or chosen — which one depends on where it appears.
Does the traditional reading fit your dream, or did it mean something else to you?
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.