The additional overrange digit referred to as a 1/2 digit.
The additional overrange digit referred to as a 1/2 digitoverflow resulting resolution ratio with range and its name is insignificant anyways.
That 1/2 digit typically shows only the values 0 or 1What really counts is accuracy.
That 1/2 digit typically shows only the values 0 or 1.
There may be some exceptions that are designed for +/-2.99 ... such as resistance overflow.
However anyone can take credit for it's definition, that's also insignificant. It is just common wisdom.
I once had a 10 1/2 digit digital counter too but resolution is insignificant usually compared to accuracy.