Some American paper currency has a star on it as part of the serial number. What does that indicate?

Question

Some American paper currency has a star on it as part of the serial number. What does that indicate?

Answer 1

Only a 33 degree Freemason knows the real answer.

Answer 2

It indicates that the serial number is the same as another currency,as another bill.It could also mean that the series was outdated or needed to be replaced.It's usually meaning that the wrong numbers are there so the star represents.It also means that the series of those bills were printed or daamaged or messed up in some way.