Star series banknotes are banknotes that have a star symbol between the prefix and the serial number. This symbol indicates that the note is a replacement for a defectively printed note. Defective notes can be those that have printing errors, are damaged, or are otherwise unfit for circulation.

According to the RBI statement, the star (*) symbol serves as an identifier, indicating that the banknote is a replacement for defectively printed ones in a packet of 100 serially numbered banknotes. These replacement banknotes are introduced into circulation to ensure the overall quality and integrity of the currency supply is maintained.

The Bank adopted the "STAR series" numbering system for replacement of defectively printed banknote in a packet of 100 pieces of serially numbered banknotes. The Star series banknotes are exactly similar to the other banknotes, but have an additional character viz., a * (star) in the number panel in the space between the prefix.

The star symbol (*) in the note number added between the prefix and the note's serial number signifies that the note has been reprinted to replace a defectively printed note. As per the RBI, the note is the same as other legal banknotes except for the star mark.