From Astro Wars
All the star systems very distant from Rana, prefixed by greek letters like Alpha, Beta, Gamma. With the number of players growing people also started to separate between Alpha Rims, Beta Rims and so on. Even Epsilon Rims have been seen already. This term was invented during Beta 4, when the Deep Space Alliance realized it would be benificial to start with some delay in order to avoid the heavy fights around Rana and to win some Beta.