Question: What does each arrow mean? There is only four ports, one on the top left most arrow in the picture, one to the right of

What does each arrow mean? There is only four ports, one on the top left most arrow in the picture, one to the right of that, one to the right of that one and one on the bottom middle. Why are there arrows going into the left and roght of the module when there are no ports there?
What does each arrow mean? There is only four

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