Final answer:
The term for the digits reported in a measurement to express uncertainty is 'significant figures.' These figures include all certain digits and the first uncertain digit, providing an indication of measurement precision.
Step-by-step explanation:
The digits that are reported for a measurement to express the uncertainty in the measured quantity are known as significant figures. The use of significant figures in measurements is vital as it gives an indication of the precision of the measurement. For example, if a length is measured as 3.12 meters, the '3.1' are the certain digits, and the '2' is the uncertain digit, but it's still significant as it provides information about the measurement’s precision. It’s important to follow the rules of significant figures when performing calculations to ensure the result reflects the precision of the original measurements.