Illustrating the orientation and rotation direction of the discs observed by the ALMA large program MAPS and analysed here. Dashed arrows mark the origin of each disc coordinate system. For convenience, we assume this reference axis to be parallel to the projected semi-major axis that is closest to the north celestial axis in counterclockwise rotation. Also shown are the signatures reported in this work as potential planet-disc interaction features in the form of both coherent and turbulent velocity fluctuations.