System&#x2F;360 was meant to be a good all-around system, not optimized specifically for business or science, as previous mainframes were, but good for both. 360 degrees in a circle, you know.<p>Notice how it skips System&#x2F;380. IBM was going to replace the mainframe line with its Future Systems project, which would have single-level store (everything is RAM, everything persists, page cache takes care of moving stuff in and out of physical disk drives) and be so tightly-integrated nobody would be able to clone it, as the plug-compatible vendors had been able to clone parts of the System&#x2F;360 and &#x2F;370 systems. The only real result of this was the AS&#x2F;400 midrange systems, now the i Series, I think.