Got a new strap of $2 from the bank today. The first note was #02444401.#128558;#128558;#128558;#128558;&&& Keep these notes: 02444402 02444420 02444444
Technically the concept applies to words that form a palindrome - that is read the same way forward and backwards. In addition to radar another common palindrome is racecar.
The same concept applies to serial numbers on banknotes - and as you correctly assumed the second one shown is indeed a radar note.
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