Arrows decleration

Hallo everyone,
when I applied exploration and Back testing, I found 2 types of arrows for the Buy signals and 2 types of arrows for the sell signals, what is the meaning of all one of them?



Green solid up arrow - Enter LONG (Buy)
Green hollow up arrow - Close Short (Buy to cover)
Red sold down arrow - Exit LONG (Sell)
Red hollow down arrow - Enter Short (Sell short)

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thanks for your efforts