I've just entered a 5$ note and the system told me that it was a radar note. I've read about it before, but now, I dont really know in witch way it's interesting. Personnaly, I dont care. But if someone could help me with that… great.
The sequence concern the 3 first and last numbers of the serial.
A radar is a note that goes something like :
1458541 or 9814189 they are the same forward or backward.
Some people collect the radar notes. If you wish to sell it or trade it, put a note in this forum or in the 'for sale' forum and someone will contact you about it.
Just remember not to list the letters if you're going to put in all the numbers.