Okay, so it's a very convenient parametrization to limit the search to a low character length. That way you can score a six-letter domain name, which is bragable. But I think this is a premature optimization.<p>Hackers (in particular) get hung up on minimizing characters, which is not at all the most important business function of your domain name. Never have I gone to type a long domain name, only to give up halfway through to instead visit a shorter-named alternative, a la Porky Pig.<p>Domain naming should instead seek to increase memorability, enable verbal communication of the name, strike a proper emotional tone, and avoid spelling ambiguities. If that happens to result in a ten-letter domain name, you know what? It's okay. Nobody cares how short your name is if they've forgotten it.<p>It occurs to me that to increase memorability, we should take a cue from mnemonics. People tend to be squeamish about mnemonic devices. Have you heard of these memory competitions where people memorize the order of a deck of cards? You would think that the people with superhuman memories have no need for "silly tricks" like visualizing animals instead of numbers, but in fact it's the effective use of those techniques that helps them memorize far better than the average fellow. The point is that some things are practically always more memorable.<p>In particular, concrete nouns, sensory adjectives, visceral actions and terms relevant and descriptive to the subject are inherently more memorable than abstract, generic, irrelevant or nonsensical words. Words that are harder to memorize accurately are also more easily misremembered for synonyms or similar-sounding words.<p>Finally, when you have a mnemonic device in your domain name, reinforce it. I would never have remembered Silverback if it wasn't for that darned cute gorilla. Even if I couldn't remember the exact name, it's the first result on Google for "gorilla app," which points out another advantage of their naming strategy.<p>I'm interested in what websites people can never remember. My hypothesis is that their names would mostly be very anti-mnemonic in nature.