The Raven is most closely associated with Odin, and as such, are birds of cunning, swift moving intelligence, esoteric wisdom, victory, war and death. Odin's two ravens, named Huginn and Muninn (translated as "thought" and "memory" respectively) sit at each of his shoulders and whisper in his ears all they see and hear.
The signs and staves seen here can be found in Icelandic grimoires, some from the 17th century, some from later times though all of them seem to be related. The origin of this peculiar Icelandic magic is difficult to ascertain. Some signs seem to be derived from medieval mysticism and renaissance occultism, while others may be related to runic culture and Germanic belief in Thor and Odinn. Most magic mentioned in court records can be found in grimoires kept in various manuscript collections.