The
Reading Steiner is a term referring to
Rintaro Okabe's ability to, after switching world lines, retain his memory of events that have occurred (from his point of view) before the switch.
Deja Vu is one of the main factors for
Reading Steiner as it was stated in the anime that the Deja Vu and Reading Steiner are highly related.
In popular culture, the
Mandela effect is equivalent to Reading Steiner. It refers to memories people have which are apparently false in our universe, but which they believe are correct in some parallel universe, and believers in the Mandela effect typically believe that they were originally in a universe where those memories were correct, but then somehow got transported to our current universe where their memories differ with reality.