Things taken by two's, either two matching objects (a pair of gloves, a pair of lovers) or a single object clearly composed of two matching parts (a pair of scissors, a pair of trousers). However, there are some interesting exceptions, mostly British regional:
pair, a set of miners that work together in a gang.
pair of moyles (mules), usually about thirty, for carrying tin.
M. A. Courtney.
in Glossary of Words in Use in Cornwall.
Published for the English Dialect Society.
London: Trübner and Company, 1880.
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Last revised: 10 July 2009.