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https://upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Use_of_a_Rock_Bar_in_trail_upkeep_within_the_Green_Mountain_Club_Long_Trail_in_Vermont.jpg/576px-Use_of_a_Rock_Bar_in_trail_upkeep_within_the_Green_Mountain_Club_Long_Trail_in_Vermont.jpg

A digging bar is a long, straight metal bar used for various purposes, including as a post hole digger, to break up or loosen hard or compacted materials such as soil, rock, concrete and ice or as a lever to move objects. Known by other names depending on locale, structural features and intended purpose such as a hop bar or crowbar in Britain, Australia and New Zealand, and slate bar, shale bar, spud bar, pinch point bar or San Angelo bar in North America, or just a bar. In Hawaii, a similar, traditional wooden device known as an ‘o‘o stick is used as a digging bar in groundbreaking ceremonies. Not to be confused with a curved crowbar, which is designed to provide leverage rather than to dig.[…]

Digging bar/Rock bar — Wikipedia