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Hello iiejlaw,
Actually what does the question mean? Can you just comment? Don't worry. I will edit my answer, after you say the question ok?
Answer:
I don't exactly know what this is but I can guess. It looks sort of like the s in the picture below, so I am assuming that this is just a symbol for a group or superhero.
Explanation:
Can you insert the diagram in your quiestion. Also hydrosphere is referring to ant sea or body of water. Hydro means water. So anything that contains water is a hydrosphere. Please get back to me when you find the diagram.