planetary classes

[throwback]

When in doubt, go to Memory Alpha.
http://en.memory-alpha.org/wiki/Vulcan_language

[Ronald Held]

AFAIK there was no canonical language guide similar to that Marc Okrund made . I asked him decades ago, but he seemed uninterested in doing one.

[Darkwing]

Christopher wrote:

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^Which does not in any way lend credence to the guess that "Class M" had anything to do with Mars. I mean, that's a completely illogical conclusion. If he had intended it to be the initial of a habitable world, obviously he would've gone with "Class E" for Earth.

I disagree. As I mentioned earlier, "Earth-Mars" conditions, abbreviated E-M, pronounced "em", fits quite reasonably. And he very well may have meant not Mars literally, but Mars-sized, barely habitable planets, just to allow wiggle room for worlds that weren't so Terran, such as Korby's planet, Exo III. Or he may have meant Mars, after all, as mentioned above about Spock.
You also seem to be pretty perturbed over this subject. Why's it such a big deal?

[CorporalCaptain]

I'd like to thank you, Darkwing, for pointing out the possible connection with the pronunciation of "em". I'd never noticed that before, and certainly it never occurred to me as a preteen way back in the 1970's.

Whether that's the path that Roddenberry actually took or not, and—again—we may never know how he actually came up with it, nevertheless it's certainly one plausible idea of how one concept might have morphed into another during early development.

My appreciation may not have been evident when I pointed out upthread that already by the pitch he had settled on just the letter "M", so I thought I'd mention it.