During religious ceremonies, many adherents choose to wear clothing that imitates the styles of dress worn in Iron Age and Early Medieval Northern Europe, sometimes termed "garb". They also often wear symbols indicating their religious allegiance. The most commonly used sign among Heathens is Mjölnir, or Thor's hammer, which is worn as a pendant, featured in Heathen art, and used as a gesture in ritual. It is sometimes used to express a particular affinity with the god Thor, however is also often used as a symbol of Heathenism as a whole, in particular representing the resilience and vitality of the religion. Another commonly used Heathen symbol is the valknut, used to represent the god Odin or Woden. Practitioners also commonly decorate their material—and sometimes themselves, in the form of tattoos—with runes, the alphabet used by Early Medieval Germanic languages.