IDIC (glossary term)
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If you're looking for fanworks titled IDIC see that disambiguation.
IDIC is a canonical term from Star Trek: The Original Series and stands for "Infinite Diversity in Infinite Combinations." In Star Trek canon, IDIC is a Vulcan philosophy and also a prestigious Vulcan award of merit. The phrase in Vulcan is Kol-Ut-Shan.
"The glory of creation is in its infinite diversity."
"And the ways our differences combine to create meaning and beauty."
-- Miranda and Spock, "Is There In Truth No Beauty?" (Star Trek: The Original Series)
"We've each learned to be delighted with what we are. The Vulcans learned that centuries before we did."
"It is basic to the Vulcan philosophy, sir. The combination of a number of things to make existence worthwhile."
-- Kirk and Spock, "The Savage Curtain" (Star Trek: The Original Series)
In my time, we knew not of Earthmen. I am pleased to see that we have differences. May we together become greater than the sum of both of us.-- 'Surak', "The Savage Curtain" (Star Trek: The Original Series) 
Star Trek fandom quickly co-opted the IDIC philosophy and internalized it to the point where it has become a cornerstone of real world fannish interactions.  "IDIC" is often used in fandom as shorthand for "To each her own," or to indicate non-judgement of fans with different preferences. 
Because for all that Trek was supposedly about New Worlds and New Civilization, when it was at its best it was always about understanding youself by seeing yourself through new eyes. IDIC isn't about notching some kind of cosmic bedpost, it's about the way that listening to a thousand different viewpoints is still not enough to tell the whole story - but that doesn't mean you stop asking. 
The Vulcan IDIC pendant was designed by Gene Roddenberry as a marketing premium long before the third season. As early as the end of the first season, fans of the show had begun writing in asking for copies of the scripts, film clip frames, etc., and these were soon sold through Roddenberry's "Lincoln Enterprises", run by Majel Barrett. As evidenced in some of his letters and memos, Roddenberry was fond of circle-and-triangle designs and had wanted to use them for purposes of theatrical unity as early as the first season's "The Return of the Archons". As reported by editor Ruth Berman (issue #1, Inside Star Trek, July 1968, pp. 15–16), "ardent rock hound and amateur lapidary" Roddenberry came up with the Vulcan philosophy after he presented Leonard Nimoy with a unique "hand-crafted piece of jewelry," a "pendent" [sic] of polished yellow gold (circle) and florentined white gold (triangle), with a stone of brilliant white fabulite — an artificial gem "developed by the laser industry and used in space mechanisms for its optical qualities," and thus well-suited as a gift for an actor in a science fiction show. Readers were encouraged to submit their interest in such a product to the then-Star Trek Enterprises mail order firm. It was noted that "less expensive materials" would keep costs down.
According to William Shatner in Star Trek Memories, the book about TOS he dictated to Chris Kreski, IDIC was only worked into the episode "Is There in Truth No Beauty?" as an afterthought. The actors all knew it was a mere advertising toy. Reportedly, Leonard Nimoy was asked to wear it and refused, so it was passed on to Shatner; when he also refused, Nimoy reluctantly agreed to wear it. At the last minute, Roddenberry sent down several pages of new script for the dinner scene, in which Spock was to give a long-winded explanation of the philosophy. The actors refused to film it until Roddenberry cut it down.
Many fannish institutions have taken their name from IDIC or related subjects. IDICon, a K/S con was held in Houston throughout the mid-'80s. The Surak Awards were named after Surak, founder of the Vulcan IDIC philosophy.
There have been several Star Trek zines and newsletters called IDIC, and others with IDIC themes, such as the United Federation of Planets Journal, which has the subtitle, "Dedicated to the Universal Understanding of I.D.I.C."
A Fan Comments
- In a 1985 issue of Interstat, a fan responds to a new subscriber's complaint about fans arguing with each other: "Those who bellow 'IDIC!' loudest in public are often those who displaythe crudest understanding of the concept...IDIC...is not a delicate, hothouse, faraway philosophical idea. It's a tough, adaptable, demanding, way of living one's life. IDIC, when confined to a television or movie screen or to the printed page, is a very pretty thing. IDIC in everyday life isn't quite so attractive; it's often aggravating as hell and ugly as sin... [reading Interstat, I] began to realize that what I was witnessing—the blood feuds, the elite alliances, the extravagant praise and vitriolic condemnations—was IDIC in action. Within the pages of Interstat...within ST fandom itself...IDIC works. Oh it creaks and groans and more often than not seems past the point of total disintegration...but it does, somehow, hold together."
- IDIC on Memory Alpha, the Star Trek wiki
- Cheap Thoughts: Variety, the Spice of Life
- Star trek and sacred ground by Jennifer E. Porter and Darcee L. McLaren.
- bradygirl_12, Recs, The Nature Of BDSM, D/s, and Other Things I understand I'm probably in the minority with this opinion but that's fine. I am happy to honor IDIC. :) Posted Jan 3, 2010. Last accessed October 25, 2010.
- melannen, In which I cannily pretend to talk about Star Trek, but am actually talking about fanfic instead. Posted May 4, 2007. Last accessed October 25, 2010.
- kindkit, TOS reviews I sort of enjoyed the discussion of the IDIC symbol (yay Kirk for coming to Spock's defense) but knowing that it was just a marketing ploy by Gene Roddenberry rather palls my enthusiasm. Posted July 10, 2009. Last accessed October 25, 2010.