I want to post another note that I found tonight and I personally think its cool because I found a 1,3 Binary recently. This note is in pretty darn good condition for being pulled out of circulation if you ask me.
Binary number, a representation for numbers using only two digits (0 and 1). The paper money hobby has expounded the definition to encompass any two numbers, 6 and 9, 3 and 7, 4 and 5, and so on.
Yes but only in the currency world like Steve said. A true binary consist of 0's and 1's. It is the language computer programmers use to make computer software.