folklore

noun3

1. •
   The tales, legends, superstitions, and traditions of a particular ethnic population.

   • Why has not England a great mythology? Our folklore has never advanced beyond daintiness, and the greater melodies about our country-side have all issued through the pipes of Greece. — 1908
2. •
   The tales, superstitions etc. of any particular group or community.
3. •
   (slang) The collective of proofs or techniques which are widely known among mathematicians, but have never been formally published.