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Freedom 7

Alan Shepard named his Mercury capsule, "Freedom 7." The seven refered to the fact that the capsule was the seventh one built, but most people assumed it refered to the original seven US astronauts.

References:

Mercury (Miscellaneous)
Alan Shepard (Miscellaneous)
Alan Shepard Jr. (Miscellaneous)
Alan B. Shepard, Jr. (Miscellaneous)
Liberty Bell 7 (Miscellaneous)