 The notion of a “defective noun” that is to be “dismissed as an irreferential fragment” clearly echoes the description of constructions as logical fictions and their expressions as mere incomplete symbols that so aptly describe the contextual definitions for definite descriptions and classes. The task of “devising interpretations” is more like the positive aspect suggested by the term “construction” and illustrated in the cases of the construction of numbers and matter. After concluding that the expression “ordered pair” was such a “defective noun”, Quine says that the notion of an ordered pair \(\langle x,y \rangle\) of two entities \(x\) and \(y\) does have “utility” and is limited only in having to fulfill one “postulate”: