Answer:
What has 3 feet but cannot walk?
In the evening I'm long, in the morning I'm smallΝΎ When seen in a ballroom, I'm nothing at all.
Five hundred begins it, five hundred ends it. Five in the middle is seen. First of all figures, the first of all letters. Take up their stations between. Join all together, and then you will bring before you the name of an eminent king.
What has a bell but isn't a church. Is full of air but is not a balloon?
I can be used to type and point you see. But don't forget, you can count on me. What am I?
What is so fragile that saying its name breaks it?