scissors

This noun is a plurale tantum, meaning it exists only in the plural form and has no singular counterpart. It refers to a single tool but is grammatically treated as plural, requiring plural verbs and pronouns (e.g., "the scissors are sharp" rather than "the scissors is sharp"). To refer to a single unit of this tool, the partitive phrase "a pair of" must be used. This allows for countability in a practical sense, where one might say "three pairs of scissors" to denote three individual tools.