Dish
Are you for Scuba?
Looks a lot like a “Best Divers Shaker Peanut”, but I would not discount a “lifestyle” thingie.
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Maybe it floats just over the diver as a diver/pair/group id float:
Diver: "Jim in red, sally is blue, tom is green"
Pair: "Why are none of the buddy teams together??"
Group: "If you are a blue diver, and you find yourself surrounded by red divers, this is not your group."