Also known as: ピッケル
A Pickaxe-shaped snow tool used by mountaineers (and also the Soviet assassin who killed Leon Trotsky). It has various regional names ~ "Eispickel" (German), "Piolet" (French) and "ピッケル (pickel)" (Japanese).
On pixiv, war hammers and pickaxes are often incorrectly tagged as ピッケル.