There’s a sci-fi movie from USSR, “Kin-dza-dza”. The natives of another planet in another galaxy were telepathes, but used language consisting of only a few words. “Koo” was for almost any word, “kiu” for swearing, “ketse” for matches (most valuable asset) and a few more. https://en.m.wikipedia.org/wiki/Kin-dza-dza!
You can make your own cert. To make sure your cert belongs to you (your site) it is signed by authority and the client then may verify that authority (which cetificate is preinstalled in their system) in fact had verified ownership of your site and then signed your cert claims with their private key.