Symbols can have Universal meanings, the one that is present in the Collective Consciousness, and also a Personal Meaning. I recommend that you keep a dream journal to keep track of what has been happening in your dreams: what you encounter, what you see and interact with. And also where are these symbols seen, what is happening when they appear. What do they do to you? What do you do to them? Is it a tool? Does it change? Is it static? How to do you feel when you see these symbols? Do you hear or taste anything? Do you feel anything Kinetically or Emotionally? All these little details can tie together to form a complex meaning of what the symbol is to you.
Most importantly, what does the symbol mean to you on a personal level? Within your own personal history, your life, any circumstances in which this symbol came up. What have you learned about this: What have people told you about this symbol, and what have you learned through your own research. You can also look online to find common meanings for this symbol in Dream Analysis. I recommend that you emphasize your personal meaning of this card before you look for information about what this symbol means to other people, because they are not you. Yes there are basic Archetypes, and meanings within the collective consciousness. However, dreams are deeply personal and customized for our subconscious, in our dream world, in our personal adventure.
If you work with Cartomancy, here is a simple three card spread that can help us analyze the meaning of a symbol within our dreams:
I also give an example by reading about my personal symbol, The Scorpion, which has reoccured in various dreams around three times already.