What is the ball on top of a flagpole called?

Question

What is the ball on top of a flagpole called?

Answer 1

It's called a ball or finial.

'A "ball-style" finial is commonly mounted to the top of a stationary flagpole'.

Edit: This is sometimes (mistakenly) called a "truck", which is the mechanism that connects the finial to the pole.

Truck - the flat plate used to keep a wooden pole from splitting.

Answer 2

Its a truck, its what as long as I have been in the Army its been called.

Answer 3

A truck, I think.

Answer 4

Truck, in this context, is undoubtedly an abbreviation of "truckle bed" which is part of the pulley mechanism, which a flag pole would have with or without superimposed ornamentation. So I cast my vote for "finial" which ornaments the apex of any narrow structure - such as a Gothic spire.