Plurale tantum

A plurale tantum (Latin for "plural only", plural form: pluralia tantum) is a noun that appears only in the plural form and does not have a singular variant for referring to a single object. In a less strict usage of the term, it can also refer to nouns whose singular form is rarely used. In English, pluralia tantum are typically words which denote objects that function as pairs or sets (spectacles, trousers, pants, scissors, clothes, electronics, bagpipes, genitals).