Encrypted Serial Number
As the Jupiter-C was part of the IRBM project, revealing the sequence of manufacture of the rockets (which are not necessarily launched in order, and may be uprated as solutions to technical problems are worked out in tests) would be revealing military secrets. So the designation painted on the sides of the rocket was not a serial number in clear text, but employed a simple transformation cypher that the staff would be sure not to forget. The key was taken from the name of the design and test base: Huntsville, Alabama, giving HUNTSVILE, with duplicated letters dropped: H was used for 1, U for 2, ..., E for 9 and X for 0. For example, the Jupiter-C modified to launch Explorer 1 had "UE" painted on the side, indicating it was S/N 29 (U→2, E→9).
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