luz

Because of its husk, the almond is generally taken to symbolize the substance hidden within its accidents; spirituality masked by dogma and ritual; reality concealed by outward appearance; and, according to the secret doctrine, the eternally hidden Truth, Treasure and Fountain.
The Hebrew word for almond, Luz (also Spanish word for light), expresses perfectly this idea of something hidden, enclosed, inviolable. The same word is also the name of an underground city and that of the indestructible kernel of being which carries within itseld the seeds of its own ressurection. This, in short, is "the nut of immortality".