A greeting card is read as words of care sent across distance. Dream books link it to being remembered, and to what you wish someone would say to you — or what you wish you had said.
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.