Ceramic coffee mug with "Berserker, Viking Special Forces", a Valknut triple-triangle and a roaring bear. The Valknut is a symbol of Odin, the god of the Berserker. The bear represents the state of mind of the raging Berserker.
The Berserker was a Viking warrior who was able to enter a state of overwhelming rage in combat, often compared to that of a wild beast, such as a bear (Berserker actually translates from Old Norse to Bear Shirt). This gave him superhuman strength and the power to ignore pain and damage. Such was their impact that the word still lives on today in the term to “go berserk”.