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It is used, along with significant digits, to indicate the precision of a measurement. Thus, in the two-significant-digit measurement 5.4 0.2 meters, the uncertainty interval is 0.2 meters. This means that the true value of the measurement is believed to lie between 5.2 meters and 5.6 meters.
Definitions of Measurement Uncertainty Terms. Terminology related to measurement uncertainty is not used consistently among experts. A compilation of key terms with definitions is included here to detail the meaning of terms, and to show the range of meanings. The definitions are taken from a sample of reference sources that represent the scope of the topic of error analysis.