A similar thing happened with the naming of the early Macintosh
models, in Macs that were based on the Motorola 68030
used the letter "x" to denote machines using the newer processor technology
. However, when they decided to release the Macinosh SE with a 68030, they named it the Macintosh SE/30
. Why? According to the Macintosh Bible
"Apparently, Apple didn't think we could handle a machine called the Macintosh SEx..."