Kidney-shaped pendant
“I thank you for your help. By Woden’s ravens, I give this to you. May it bring you good fortune just as it has done for me.”
Kidney-shaped pendants are mainly found along Frisia's coastline. Citizens from Frisia literally embodied their faith with such pendants, as evidenced by the stylized depictions of the high god Woden and his two ravens. The two spirals would be two stylized raven beaks curling inwards, but also Woden's curled moustache.
On the other hand, modern Frisians could recognize something else in it: the image of a pompeblêd, the Frisian word for an aquatic plant leaf also found on the Frisian flag. It is speculative, but perhaps these kidney-shaped pendants are predecessors of the symbols on the Frisian flag. Either way, remarkable.
MythWatch
Jewellery can tell us a great deal about a character without stating it explicitly. In MythWatch, pendants like these are a good way of showing the wearer’s faith. Due to their religious connection, they could even serve as treasure or special gifts. Perhaps they could have mythical or magical properties, like granting the wearer a “Blessed” status card once per session when they visit a holy site of Woden.
As an additional fun fact: on the MythWatch character sheets a Mythmaker's Resolve is designed after these kidney-shaped pendants.