" On the final stretch of the road we passed three or four hammer-stones set on the verges to honour the thunder-god. Snorri checked for rune-stones around each, but found only a stray black pebble, river-smoothed and wide enough to cover his palm, bearing a single rune. Perhaps local children made off with the rest.
'Thuriaz.' He let it fall.
'Hmmm?'
'Thorns.' He shrugged. 'It means nothing. "

― Mark Lawrence , Prince of Fools (The Red Queen's War, #1)