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A pickaxe, pick-axe, or pick is a generally T-shaped hand tool used for prying. Its head is typically metal, attached perpendicularly to a longer handle, traditionally made of wood, occasionally metal, and increasingly fiberglass. A standard pickaxe, similar to a "pick mattock", has a pointed end on one side of its head and a broad flat "axe ...
Pickaxe. A mattock ( / ˈmætək /) is a hand tool used for digging, prying, and chopping. Similar to the pickaxe, it has a long handle and a stout head which combines either a vertical axe blade with a horizontal adze ( cutter mattock ), or a pick and an adze ( pick mattock ). A cutter mattock is similar to a Pulaski used in fighting fires.
Digging bar. 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 ...
A hand axe (or handaxe or Acheulean hand axe) is a prehistoric stone tool with two faces that is the longest-used tool in human history. [ 1] It is made from stone, usually flint or chert that has been "reduced" and shaped from a larger piece by knapping, or hitting against another stone. They are characteristic of the lower Acheulean and ...
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Spade. A spade is a tool primarily for digging consisting of a long handle and blade, typically with the blade narrower and flatter than the common shovel. [ 1] Early spades were made of riven wood or of animal bones (often shoulder blades ). After the art of metalworking was developed, spades were made with sharper tips of metal.
Tau in astronomy is a measure of optical depth, or how much sunlight cannot penetrate the atmosphere. In the physical sciences, tau is sometimes used as time variable, to avoid confusing t as temperature. Time constant (also relaxation time) of any system, such as an RC circuit. Torque, the rotational force in mechanics.
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