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On d.tube? On YouTube it's an End Screen. if you go to edit a video and one of the tabs says "End Screen & Annotations." If it's that on D.tube I'll change it!

like intro( "in"tro ) for the start comes outro ( "out"ro) for the end

Right I'm talking about post outro for YouTube :)

Where it lets you sub or watch a different video etc.

hope that makes more sense, mate!