Typeglob

This is a typeglob:

  *duck

It represents all of the variables with the name "duck."  $duck, @duck, %duck, &duck.  Even some more that don't have sigils.  It has seven slots in all, including one that points to itself.  It needs one since it has its own sigil!

Just about the neatest thing you can do with typeglobs is aliasing.  But first we have to learn about...