WordPress vs. WP usage. Where is the source?

I’ve got a question that is kind of strange.
There is a lot going on about how third-parties are supposed to use “WP” instead of “WordPress” in their company/site/product name to differentiate it from official WordPress things (i.e. directly by an agency of the WordPress company). By reason of example, it would be the difference between “www.remarpro.com” and “WP Super Cache”.

Anyway, I am very certain that I have read this principle on this site somewhere… but now I can’t find it! I’ve done several searches, but I can’t remember very much about where I found it, and I can’t seem to hit on search terms that will reveal the article. If anyone who knows where to find this info would post a link, I would be very grateful!

Thanks,
MB3D

P.S. Mods: If my query is in some way not in accordance with the forum rules (i.e. I must find it on my own), please delete this thread. Thanks ??