In Jewish folklore they are called "lamedvovniks", from the gematria numerical value for 36. In Hasidism, with its social institution of the Tzadik in the central role of the community, the 36 may not necessarily be unknown, therefore. However, a Hasidic aphorism describes a known Rebbe Tzadik as being among the 36, as their true greatness could be concealed beyond the perception of their devoted followers.