The most common term for the effect where people remember a world differently from the way it is now, is the Mandela effect, after president Mandela of South Africa. This was one of the first cases to catch people's attention: some remember him having died in prison in the 1980s, rather than becoming president and steering South Africa into a more peaceful time.
While the term isn't a bad one, a better name for the effect is the mandala effect. A mandala is employed for focusing the attention of practitioners and adepts. It is intended to call people's attention to it and help them to notice what is happening, as a spiritual guidance tool and an aid to meditation.
A mandala is a tool to help people to notice and make them more aware, which is exactly what this effect is doing. It is making millions of people aware of the Shift and the changes in our world.