Plain i860 seems to be silly indeed, but i guess it's true: look at the article posted today on The Register and take a closer look at the specsheet they're displaying there: Intel 82860 chipset!!! So i guess 860 is right after all, although it sounds o so silly - people will call it that way!
http://www.theregister.co.uk/content/3/18439.htm l
- http://www.theregister.co.uk/content/3/18439.ht
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More info on the original i860 RISC-CPU: