The word 'standard' has several meaning. Classically, standard
refers to a flag or a banner. The modern primary meaning of standard is
an acknowledged measure of comparison of quantitative and qualitative
value. Gears should have a standard value for all their measurements. In
technical use, a standard is a concrete example of an item or a
specification against which all others may be measured. For example,
there are primary standards for length, mass. There are other units of
measurements also that is established by standard organizations.
Officially certified measuring instruments must be checked for accuracy
using such standards.
There are many advantages of using a standard. They are becoming
increasing important to trade because they can form the basis of a
common understanding between trading partners. They can also reassure
customers, who often buy products with a standard as an indication of
quality and safety.
