When Xeon quit the first time, his was named Lifetank X. When I took it over, I renamed it to XI and made the version number 11.*.* (XI = 11 = yeah..)
I just did it to differentiate between the new and old mainly.
After I decided to take a break from AC, I asked Swordz, Ftuoil, and Xeon to help develop Lifetank. I thought this would be the best idea for the plugin to have some original devs on it again and they could bring more to it than I could (and they have!)
Right now the "X" version is the development version. It's untested and not "official" so to say. I guess Xeon leaves it named that for old time's sake
C
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and don't blink.