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If you read the source, Prisoner X or X has been used to refer other people: "His trial was held in camera and even his wife was banned from attending the proceedings involving the state against 'X,'"; "Another Prisoner X was Mordechai 'Motke' Kedar". Thus, this page is a stub on the term, and not a redirect - Evad37[talk] 04:52, 23 February 2014 (UTC)
If you look for sources I think you will find that your statement 'Only one of these three people is referred to as "Prisoner X"' is inaccurate. In fact, there are more e.g. "Several papers on Friday carried details of other 'Prisoner Xs', including Mordechai Kedar, a military intelligence officer who murdered a collaborator, KGB spies Marcus Klingberg and Shabtai Kalmanovich and Nahum Manbar."Sean.hoyland - talk 05:08, 23 February 2014 (UTC)