What is dimension x ( not the show)?

I read about this dimension x, but when i look it up i get a T.V show. :-/When i say dimension x i mean like science stuff. Like actual facts in scinc

I read about this dimension x, but when i look it up i get a T.V show. :-/
When i say dimension x i mean like science stuff. Like actual facts in scince, i em studying this for my project please help.

or:I read about this dimension x, but when i look it up i get a T.V show. :-/When i say dimension x i mean like science stuff. Like actual facts in scince, i em studying this for my project please help.

or:I read a lot about different dimensions in science but never came upon a dimension X. If I recall correctly there has been a dimension x in the famed TV-Series Teenage Mutant Hero Turtels. Before the discovery of Pluto there has been a Planet X hypothesis. But thats all I got.

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