Hello Neel, Thanks for your comment and your question. It's always great to see engagement and curiosity about the symbolism found in Tarot. In the context of the Ace of Cups card, the "M" typically stands for the Latin word "Mundus", meaning "world" or "universe". This is a symbolic reminder that the Aces represent the most raw, pure, and potent form of their respective elements in relation to the world or universe. As for your question regarding the 5 elements, the Ace of Cups primarily represents the element of water. This signifies emotions, intuition, and the subconscious. The other four aces in the tarot deck represent the remaining elements: wands (fire), swords (air), and pentacles (earth), with the fifth element, spirit, being represented by the major arcana. That being said, Tarot is a highly personal journey and the meanings can be flexible and adaptable to your personal understandings or intuition. If in your readings, you feel that the "M" represents Material or the 5 Elements, and it helps your interpretations and understanding, by all means, follow your intuition. I hope this brings clarity. Please feel free to reach out if you have any more questions. Your interest and engagement in this beautiful art form is truly appreciated. Warm Regards, Siddhartha