Bitcoin / US Dollar Perpetual Inverse Swap ContractBitMEX
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The volume price trend ( VPT ) indicator helps determine a security’s price direction and strength of price change. The indicator consists of a cumulative volume line that adds or subtracts a multiple of the percentage change in a share price’s trend and current volume , depending upon the security’s upward or downward movements.
so the arrow represent spike in volume vpt either downward or upward