Answer:
I mean goodbye for South Americans.
Tool of thief, toy of queen. Always used to be unseen. Sign of joy, sign of sorrow. Giving all likeness borrowed.
I can be repeated but rarely in the same way. I can't be changed but can be rewritten. I can be passed down, but should not be forgotten. What am I?
You find me behind the stars; or in a sixth seventh or third. It takes something round a computer and me to make pie. I am bigger than anything you can think of.
You see a boat filled with people. It has not sunk but when you look again you don't see a single person on the boat. Why?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.