What does X stand for?

MLA style: "X." Acronym Finder . 2012. AcronymFinder.com 30 May. 2012 <a href="http://www.acronymfinder.com/Experimental-(US-Military-aircraft-designation%2c-as-in-X_1)-(X).html">http://www.acronymfinder.com/Experimental-(US-Military-aircraft-designation%2c-as-in-X_1)-(X).html
Chicago style: Acronym Finder . S.v. "X." Retrieved May 30 2012 from <a href="http://www.acronymfinder.com/Experimental-(US-Military-aircraft-designation%2c-as-in-X_1)-(X).html">http://www.acronymfinder.com/Experimental-(US-Military-aircraft-designation%2c-as-in-X_1)-(X).html
APA style: X. (n.d.) Acronym Finder. (2012). Retrieved May 30 2012 from <a href="http://www.acronymfinder.com/Experimental-(US-Military-aircraft-designation%2c-as-in-X_1)-(X).html">http://www.acronymfinder.com/Experimental-(US-Military-aircraft-designation%2c-as-in-X_1)-(X).html

Experimental (US Military aircraft designation, as in X-1)

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