It's not a Fibonacci series and it's not a prime number series. It might be the second three denominations of U.S paper currency, but it's not. (Yes, Virginia, there is a U.S. $2 bill.)
Instead, it's a measure of the potential impact and uptake (or lack thereof) of new technologies.
To see why, let's move from the abstract to the concrete, considering when new technologies gain credence.