Valknut Symbol

Valknut is a Viking symbol of three interconnected triangles, and appears on various Germanic objects. A number of theories have been proposed for its significance.
The name Valknut is an unattested modern invention used to describe the symbol, and was not used contemporaneously when the symbol was used. The Valknut has been compared to the three-horned symbol found on the 9th century Snoldelev Stone, and may be related to it.
The word valknut is a neologism: it is formed in modern times through combination of ON valr, ‘the dead’ or ‘the slain’ and knut, ‘knot’.
The original meaning and function of the valknut is not wholly clear. The number three is a very common magic symbol in many cultures. However, in Scandinavian context three multiplied by three might designate the nine worlds, which are united by the Yggdrasil tree.