Rock-Paper-Scissors can fall into a subcategory of Simultaneous Action Selection or Trick-Playing. However, simultaneity is not the most defining quality. Turn-about games also frequently employ this mechanic.
Its defining feature is that there is a circular, non-transitive hierarchy for which pieces win against or capture others. That is, while A might beat B, and B beat C, C beats A.
The name derives from the well-known children's game where
Scissors cuts Paper
Paper covers Rock
Rock crushes Scissors
But can refer to any game with non-transitive mechanics, e.g.