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Poly Normal selection Mode :
This mode allow to select polygons using their orientation

NB : 2D polygon are also processed.

Starting Shape
Select the direction reference polygon
Set the normal matching value :
100 % means exact orientation
less than 100% allow to select polygons with an orientation near the reference one.
Decreasing normal matching will select more and more polygons
Result : polygons with a direction matching the reference from 75% to 100% are selected
You can add many different starting directions
you can also use predefined direction axis
In this case, only polygons facing Y+ from 75% to 100% are selected
You can do a selection and automatically select polygons with the opposite direction
Activate the "Add opposite" option