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The number refers to the reported time of death of pope John Paul II, 9:37 PM or 21:37, as Poland uses a 24 hour system. The use of the number is connected with memes about the late pope, as there was almost a cult folllowing for JP2, noone was allowed to even criticize him, after his death, with time popped out evidence of the pope not being such a great person, so people started meme'ing on him.