Replacement banknote

Replacement bills have different symbols to mark the error around the world, although the most popular examples are "star notes".

This saves time and money compared to re-printing exactly the same serial number that was used before.

When notes are discovered that have been printed incorrectly (such as having the serial numbers upside down, etc.)

[4][5] Star notes are highly sought after by collectors and are sold for a price exceeding their face value depending on how low the serial number is.

Both paper and polymer replacement notes exist as this control mechanism.