React DevTools Profiler Shows Hook N - What Does That Mean?

The call-order index of that hook within the component's render - the 18th hook invoked, counted top to bottom through every useState, useEffect, useRef, and library-internal hook call

A unique ID assigned to that specific useState call the first time the component ever mounted, persisting across all future renders

The depth of that hook's dependency array, indicating it depends on 18 other pieces of state

The line number in the source file where that hook is declared