The dragon was most likely thought to convey the ideas of strength and bravery. So wearing a dragon motif would symbolize these ideas. It's also clear the dragon symbol would be used to ward off other beasts and creatures, so it could offer protection too.
Runes, also known as the Norse alphabet, is an extinct group of alphabets used by many Norse peoples to record information, especially the Vikings. It is widely used in Scandinavia and the British Isles.
