The singulative of scissors is a pair of scissors.
Of or pertaining to a grammatical form or construction that expresses the individuation of a single referent from a mass noun
English doesn't have a singulative number in general, but many uncountable nouns have usual singulative constructions.
of or pertaining to a grammatical form or construction that expresses the individuation of a single referent from a collective or mass noun; a singular entity as opposed to a collective