What does $\cong$ mean when considering two random variables?

Question

I encounter the $\cong$ sign when reading a book on probability, however I'm not sure about its exact meaning:

(Bryc W. The normal distribution: characterizations with applications[M]. Springer Science & Business Media, 2012.)

Does $X\cong Y$ (where $X$ and $Y$ are two random variables) means X and Y have the same distribution?

Answer 1

Yes, those notation usually denotes having same distribution