 A quantifier such as evso is intuitively not constant, in the sense that it doesn’t mean the same, or is not interpreted by the same rule, on every universe. Ext can be seen as a strong requirement of constancy: the rule interpreting Q doesn’t even mention the universe. Indeed, many quantifiers from language and logic are Ext. As we saw, all relativized quantifiers are Ext, and all the other quantifiers in the lists \eqref{ex-qlist2}–\eqref{ex-qlist4} as well, except  W.[24]  In fact, it seems that all quantifiers taking more than one argument that show up in natural language contexts are Ext. And many type \({\langle}1{\rangle}\) quantifiers are Ext too, for example, \(\exists\), \(I_j\), \(Q^A\) (when Q is Ext; see \eqref{QA} above), and all in the list \eqref{ex-qlist1} except \(Q^R\).