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As Fizzlemizz mentioned, it's _G, which is the global table in Lua. At some point, the code you have, or the code you got from someone else, was subject to a replace all in an editor where they replaced the underscore character with "placeholder". Typical coding practices use the underscore as a throwaway object for function returns they don't want, but in the case of _G, it is part of the name of that object.
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