Mr. O'Meter -
It isn't an instrument so much as a method. It should probably be renamed the Steve Curry Method for Determining Max Speed for Greens on Any Course (someone else will have to work that into some sort of acronym).
You'll have to ask Steve directly someday, but I think it was something along the lines of taking the most severe green on a course, finding a max speed where it's still puttable, measuring the speed, & then adjusting all other greens to match. It sounds way too logical to catch on.
There are lots of Postulates that fit this site, but would probably cause any outsiders to send the men in the white coats after us.
To name just a few:
The Mucci Postulate - You must play a course before commenting on it.
Which is then amended with the Mucci Corollary - You can't comment on photos without having played the course.
Fortunately, these rules are routinely ignored, to the betterment of the site. (Sorry, Patrick.)
There's also the Ward Postulate: Playing trumps all.
I can't figure Rich Goodale's positions out enough to come up with one for him, but it would probably involve some sort of contrarian approach.
No GCA dictionary would be complete without the word bias & its many synonyms.
P.S. I decided to leave off all the smileys 'cause it would've entailed one every paragraph. Suffice it to say, this post reeks of sarcasm.