Metal
From Illogicopedia
Metal is a shiny thing that you can rub things against. If you polish it enough you can see not only your reflection but also a mirror image of the whole universe rolled up into a double super coil.
Be wise. Do not rub it too much or everything will deflate.
[edit] History of metalinguistic
Metal has long been revered by erasers. You'll understand after you've looked at metal.