I've been trying to figure out how to search for information
regarding www1. thru www15. and how that works. Does anyone know how this is done?

I'm not sure what you are trying to do. Simply trying to set-up sites with names like ww1, ww2, etc? That is only a DNS configuration. Hostnames are arbitrary and can be anything.yourdomain.com . www is just a name and nothing magical either. games.yourdomain.com is technically no different than www.yourdomain.com.

So if that is the question then it is only a matter of configuring your DNS server and creating the names as you desire. We need more information about your goals and then what capabilities you have with the DNS (either you have control over it or someone else does).

Correct me if im wrong but there is more than just one world wide web.

www.
www1.
www2.
www3.

And so on...

http://wwww.pair.com
http://wwww1.pair.com
http://wwww2.pair.com
http://wwww3.pair.com

I was trying to figure out how this is achived.
Some sites will pull up under this system and I thought
it would be neat to do with my sites.

I understand what your saying with subdomains under cpanel.
I just thought there was more than one world wide web...

Here is another example...

https://xoops.org
http://www1.xoops.org
http://www2.xoops.org
http://www3.xoops.org
http://www4.xoops.org

and so on....

For now there is one internet and one world wide web. The www, ww2, www2, etc. etc. has no meaning except it is a name. Don't confuse sub-domains as mentioned on a web host with a www.yourdomain.com, they are the same thing. Where you point those names can be different or the same.

So if you wanted to have ww1, www1, www2, jokes, anything, you just need to create it in DNS and point the IP where you wish. If you wanted to have all the variations point to the same website the usual method is a CNAME entry.
I.E.:
yourdomain.com a 192.168.1.1
www.yourdomain.com CNAME yourdomain.com
ww2.yourdomain.com CNAME yourdomain.com

This makes all of them point to the same server. I don't know Cpanel but I think the equivalent is a "parked domain". If you can't do that in Cpanel for variations in name like ww2 or if creating a "sub-domain" as they call it can't point to the same server (vs a sub directory) then that is a limitation of Cpanel or the ISP. Many sites will have a variety of names and domains all pointing to the same server. But the path and protocol is the same. "Smoke and mirrors".

If you want to resolve any non-existent hostname in your domain into single host you have to write in zone definition something like

www IN A 1.2.3.4
* IN CNAME www

It is true that a host name is a host name is a host name.

Sub Domains are no different, like it explained above.

However, in the past we did a kind of neet thing with them.

client1.obscorp.com
client2.obscorp.com

each pulled the same site customized to the client.

We stopped that, but it was kind of cool.