In Uncharted 2: Among Thieves, you find yourself within a city in Nepal where you continue your search for Shambala and the Cintimani Stone. When you find the second group of enemies you can see a street sign which says "Club Raja".

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This is a reference to one of Nathan Drake's Adversaries in Uncharted Drake's Fortune who went by the name of Eddy Raja.

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This was one of the first references within Uncharted 2 to mention it's predecessor.