Yggdrasil, the tree of life (Norse mythology). Its many roots and limbs keep all the different worlds together: Asgard, Midgard, Helheim, Niflheim, Muspellheim, Svartalfheim, Alfheim, Vanaheim and Jotunheim. Below its roots there is the spring that fills Mimisbrunnr, the well of wisdom, guarded by Mimir.
In the Germanic and Scandinavian cosmovision, this God of Thunder travelled in the sky in a cart drawn by two goats, carrying his Hammer, which was used in those cultures as a magical symbol that allows the bearer to destroy obstacles and barriers along the way to happiness. If you have problems, people or situations that do not know how to face or you cannot find a solution to your problems, the hammer will act for you, opening gaps with silver linings, while increasing your strength and power to face to any situation.
Runes are the letters used to write Germanic languages from antiquity to the Middle Ages. Runes were used not only for writing. They were considered, and are once again being considered as magical instruments, carriers of secrets and power generators, so runes were used as oracles in divination rituals. It was believed that the rune was the symbol of the object that it shared its name with and as such was an emanation of its energy that could awaken the senses and create emotions. The word "rune" implies the notion of "one who knows" in Old German: whisper. "Run-wita": start at the secrets. But the word comes from the Scandinavian "Run" which means "secret" and "Helrun" which means riddle. Therefore, reading runes means something like "learn to unlock the secrets."