It looks to me, like a wire designation for the tube/line. Kind of like a warning tag.
Like which way the wire is. The one in OP was the clearest one but they seem to be a few on this thing.
I asked on here yrs ago and no one knew what it was, maybe a laser or something I think they said but I still trying to find out what these guys were making.
I remember this. I think it was called Project Eyechaser and was never completed because they couldn't find a suitable way to test it.Like which way the wire is. The one in OP was the clearest one but they seem to be a few on this thing.
I asked on here yrs ago and no one knew what it was, maybe a laser or something I think they said but I still trying to find out what these guys were making.