There Are No Indexes

Tropes about something which one would expect to exist (as an inevitable part of Real Life, or a logical extrapolation from known aspects thereof) being conspicuous by its absence. In some cases these are Acceptable Breaks from Reality that facilitate Conservation of Detail, but they often inspire a degree of Fridge Logic.

See also Censorship Tropes, This Index Does Not Exist, That Which Must Not Be Indexed, and We Will Not Use an Index in the Future.