A symbol of strength and potential, it was also a Nordic and Celtic symbol of fertility, and immortality. The god Thor's Life Tree was oak. Druids believed the consumption of acorns would help see the future, and the word Druid can be translated as "Oak Knowledge". ... The acorn is the fruit of the oak tree.
One little acorn, with time, can also be the start of a whole forest of mighty oak trees. Acorns are also considered to be a lucky symbol, representing prosperity, youthfulness, power and spiritual growth.
Long before acorns were considered good luck, they were associated with magic between two witches. ... As a good luck symbol, acorns are said to protect one's health. Carrying an acorn is believed to protect from illnesses, aches, and other pains.