In your example one writes 0.123(4). I don't know what the notation is called, but it's discussed here: https://en.wikipedia.org/wiki/Uncertainty#Measurements

In your example one writes 0.123(4). I don't know what the notation is called, but it's discussed here: https://en.wikipedia.org/wiki/Uncertainty#Measurements https://en.wikipedia.org/wiki/Uncertainty#Measurements