SIG (Special Interest Group)

Synonyms:
See also:
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SIG (Special Interest Group) is a community of Mensa fans that focus on a specific topic.

Many are not fannish, but some are, including ones for Star Trek, Star Wars, and Doctor Who.

From a fan in 1981:

Mensa is, as some may know, the society for people in the 99th percentile of the population, IQ-wise. Just starting up in this society is a Special Interest Group dealing with Star Wars. Although one must be a member of Mensa to officially belong to the SIG, the Newsletter is available to non-Mensans. The Newsletter is called LuMinous Beings...

Examples

Morbius was a Doctor Who newsletter published by "Newsletter of the Doctor Who SIG."

Almost Human, Q-de-grace, Shotten Herrings, Trenhaile, and Zodiac are Star Trek: TNG novels published by a British Star Trek SIG called British Mensa Ltd..

TREKisM, a Star Trek community, published a long-running newsletter called TREKisM as well as TREKisM at Length, a zine of fiction, art and non-fiction.