R.U.R. is a 1920 science fiction play by the Czech writer Karel Čapek. R.U.R. stands for Rossumovi Univerzální Roboti (Rossum's Universal Robots). The English phrase "Rossum's Universal Robots" has been used as a subtitle. It premiered on 25 January 1921 and introduced the word "robot" to the English language and to science fiction as a whole.