Whatever way you define it, look at the spirit of most designations.
A Radar is a mathematical Palindrome.
A Rotator is also a Math based phenomenon.
A Repeater is a cyclical movement of digits (again mathematical).
The mathematical lean on binary would suggest the mathematic definition -- 0s and 1s.
Regardless of how you look at it, Notes with 0s and 1s seem to be alot more popular.
Now, if the dictionary def's alludes to a regular two digit note as binary, then I guess as long as the buyer and seller both agree, or the collector gets what he/she wants, then all is well anyways.
Hehe... in that case I have many non-mathematical binary notes (for sale to boot!).
Anyway,
We should probably look at the the spirit of the definition.
Take care y'all.
Huds
Square Ascending Ladder Note:
1491625 --> 1 4 9 16 25
I would keep one of those if I found it!! But I am a math nut.