Oak tree — a symbol of longevity, wisdom, strength and endurance. Oak is dedicated to Zeus, Thor, Perun and the other gods of thunder. Altar of Zeus surrounded oaks grew around temples Perun oak grove. In honor of Perun constantly lit bonfires of oak branches. Under the oaks Druids held their rituals for which the oak symbolized the world axis. Oak tree — a symbol of male power. Acorn has been offering to the Scandinavian god Thor. The Celts had a phallic significance acorn. In addition, the acorn - a symbol of prosperity, fertility and spiritual energy. According to some to believe, Christ was crucified on the cross of oak. In some countries, oak leaves are used as military insignia.