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I can't tell what this means. Im trying to read on automorphic forms outside of modular forms and I see sources talking about this $GL(n)$ thing and I have no reference to interpret this. The closest thing I've seen resembling $GL(n)$ in literature $GL(n, F)$.

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    "Algebra: A Graduate Course" by Isaacs has just about all the info on this you could ever want, and a bunch more, too. – 2017-02-17
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    @TheCount thanks you – 2017-02-17
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    In $GL(n,F)$ the scalar field is $F$. The notation $GL(n)$ is the same, except that $F$ is not mentioned. This could be because it is irrelevant, or because it is assumed known, or because it is specified earlier in the same paragraph/page/chapter... – 2017-02-17
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    Continuing @David's answer, when $F$ is not mentioned it's often assumed to be $\mathbb{R}$, or if not that, then $\mathbb{C}$. – 2017-02-17
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    Invertible $n \times n$ matrices. – 2017-02-17
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    ^ there's your overall answer. – 2017-02-17
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    @TheCount how do i end this question. Do i close it? – 2017-02-17
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    Nah, you can just leave it. Perhaps @copper.hat would be willing to write a short answer and you can accept it. – 2017-02-17
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    @TheCount: You were first :-). – 2017-02-17
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    $\mathfrak{thanks guys}$ – 2017-02-17
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    In the theory of algebraic groups GL(n) would mean "a group scheme", which is a functor from commutative rings to groups. – 2017-02-17

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Posting as answer as per request:

"Algebra: A Graduate Course" by Isaacs has just about all the info on this you could ever want, and a bunch more, too.