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The symbol $'$ is a general indicator of another version of or another type of where the specific version or type that is being described is to be defined.
The symbol $x'$ should technically be voiced x prime, although colloquially referred to as some variant of x dash or x tick or whatever can be devised by the ingenuity of the reader.
The $\LaTeX$ code for \(x'\) is
- 1989: Ephraim J. Borowski and Jonathan M. Borwein: Dictionary of Mathematics ... (previous) ... (next): prime: 5.