The arrows icon that appears on some device file images and in the Neuron device specifications means that the device is compatible with IO-Link.
This icon is included in the image generated by the manufacturer that comes with the device's IODD. Like the rest of IODD specifications, it's automatically established when linking a device to Neuron.
It's a universal symbol used to refer to a device that's compatible with IO-Link, therefore, both the image and the icon can't be modified or replaced.