the meaning of ,*, in documentation

[Skaperen]

i know i asked this long ago, but i never did get an answer. in the specification of many functions and methods it gives a ,*, in the list of arguments. i cannot find any description of what that means. i have been ignoring it and had success, anyway, but this worries me and i am still curious. i tried to search for my old thread but it seems the search means can't handle ,*,.