Newbie Question about this@Typename

I have written a fair bit on Kotlin but struggle to know what the @ sign means in the code below. I am guessing it is a) a check for @nonnull, b) required to use java, or my other guess c) is documentation helper. Would be keen to know the answer but also keen to find how to use the documentation to get the answer.

layoutManager = LinearLayoutManager(this@StaticObjectDetectionActivity, RecyclerView.HORIZONTAL, false)



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