The following terms are used here and in literature elsewhere to discuss reference materials.

All | # A B C E I J M N O P Q R S T U W
There are 2 names in this directory beginning with the letter T.
Tolerance Interval
A measure of homogeneity of one or more parameters in a reference material in which there is a fixed probability the specified interval will contain at least a specified proportion r of the population from which the sample is taken.
Trueness
The closeness of agreement between the average of an infinite number of replicate measured quantity values and a reference quantity value.