boat axe
/ˈbəʊt aks/(US boat ax)
noun
1An axe carried on board a boat.
2 Archaeol. A type of thin, stone battleaxe with a head shaped like an upturned boat, used in the late Neolithic period in the Baltic region and Scandinavia, especially as a symbol of social status.
Origin
Early 19th century; earliest use found in William Scoresby (1789–1857), Arctic scientist and Church of England clergyman. From boat + axe.