The word valknut is a modern word used to describe symbols found in eighth and ninth century Norse artifacts found in Scandinavia by archaeologists. The valknut symbol itself consists of three overlaid and perhaps interlocking equilateral triangles, used as a decoration, perhaps with religious significance, on pottery, bedposts, grave decorations and the like. The word valknut in a modern invention, not found in extant ancient texts or inscriptions. which nonetheless derive from the Old Norse words "valr" meaning "fallen warriors" and "knut" meaning "knot." It is not currently known what the symbol meant, though there are various modern speculative theories. Since the valknut symbol has been found on artifacts that might have been worn (such as a ring), and since textiles or skins bearing the valknut symbol would presumably have deteriorated or perished over the centuries, it is possible the people we now call Vikings might have worn some article of clothing or jewelry bearing the valknut. But until such an article -- or its contemporary graphic representation -- turns up, it will not be possible to state conclusively that Vikings did wear the valknut.

The meaning of the valknut is disputed but the determined meaning is that it symbolizes loyalty in odin and a warriors death who is sent to valhalla so it symbolizes three things

1. loyalty to odin

2. a warriors death

3. valhalla

According to Alfred Becker, the Franks Casket is a good example for all this: It shows a a warriors

death and his entry into valhalla, fighting there, loyal to Odin. For detail view Franks-Casket.de

It is a Triquetra. It was first seen in ancient Germanic paganism as a rune-stone similar to the Valknut and then in Celtic artwork as space filler or ornament. It's first known use as a religious symbol was with Christians during the Celtic revival of the 19th century. The symbol bore resemblance to the three-leafed shamrock that St. Patrick offered as a trinity symbol, so it became another symbol of the Holy Trinity (Father, Son, Holy Spirit).

Neopaganism has adopted the symbol to represent among many other things to symbolize the three stages of woman (Maiden, Wife, Crone). Wiccans generally use the symbol to represent the three parts of human existence (mind, body, soul).