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OldNormanBates : unclaimed profit or loss , meaning unsold stock at the moment. But haven't really lost that yet,still holding.. Would be the same if it was a Positive Number..Profit that's still held without selling yet.

Judah Thomas OP : Thank you, I now understand.

BullRunner : Its when a trader has a profit or lost. It changes since it correspondence with a open position. When they have a hold or open. Because of the floating a trader can keep track of how their positions are doing and see when he closes them.