Intel stands for Intel, (R) stands for registered trademark, and core2 stands for LGA775 as the more advanced interface of Core 2 series CPU. Others include celeron (Celeron, low-end, the best E 1400, L2 only has 5 12k), Pentium (needless to say, P4 that galloped on the battlefield in that year was Pentium series) and DUO.