On 10/02/2017 17:11, Graeme Wall wrote:

There was a fad for things to be called name 7 at the time, I blame it
on the BBC! https://en.wikipedia.org/wiki/Blake%27s_7

In 1998 when Sun's Solaris OS reached version 2.7 they dropped the '2.',
leaving just 7.
I assumed it was to match Oracle's database version scheme.

--
Eiron.