I’ve heard of this tool before but I can’t remember the name. The tool is a tool that teams use to line up their robot before they begin autonomous to make sure that their robot is in the perfect position to make sure that their code works according to their plan…
Distance sensors can be very inaccurate at times. If they work for you then that’s great, but they may not work well for everyone else. From my experience, having an alignment tool/consistent starting position has worked better than having the robot figure out its starting position with a distance sensor.
Yes, most teams build it out of metal or other materials. My team personally used VEX cardboard because it was easier to cut/use, but metal would be better in the long run due to its strength/resistance to bending.
Here is a good (albeit low quality) example of one used by 7258A during Turning Point Worlds. They used it to have an extremely competitive 4 high flag auton and made it to the overall finals in the Dome.