Spade
A spade is a tool primarily for digging comprising a blade – typically curved and more pointed than that of a common shovel – and a long handle. 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. Before the introduction of metal spades manual labor was less efficient at moving earth, with picks being required to break up the soil in addition to a spade for moving the dirt. With a metal tip, a spade can both break and move the  earth in most situations, increasing efficiency. A classic spade, with a narrow body and flat (or near flat) tip is suited for digging post holes, and is not to be confused with a "roundpoint" shovel, which has a wider body and tapered tip. Etymology. English "spade" is from Old English ' (f.) or ' (m.). The same word is found in Old Frisian ' and Old Saxon '. High German "" only appears in Early Modern German, probably loaned from Low German. In the Netherlands, Denmark, Sweden and Norway the word is "spade" as well. Other Scandinavian forms are in turn loaned from German. The  term may thus not originate in Common Germanic and appears to be a North Sea Germanic innovation or loaned. Closely related is Greek : , whence Latin "". Designs. Spades are made in many shapes and sizes, for a variety of different functions and jobs, and there are many different designs used in spade manufacturing. People often mistakenly use the word "shovel" interchangeably with spade but shovel is a generic term for a variety of tools that include numerous broad-bottomed versions for moving loose materials, such as a "coal shovel", "snow shovel", "grain shovel", etc., whereas spades tend to have a sharpened  edge, curved profile, and pointed end better designed for digging. Noting that the term "garden spade" is attached to certain sharp-edged but square ended tools suited to cutting through sod. The most common garden spade typically has a long handle, is wide, and is treaded (has rests for the feet to drive the spade into the ground). An "Irish spade" is similar to a common garden spade, with the same general design, although it has a much thinner head. A "sharpshooter" is a narrow spade. A "turfing iron" has a short, round head, and is used for cutting and  paring off turf. A "digging fork," or "grape," not referred to as a spade, is forked much like a pitchfork, and is useful for loosening ground and gardening. Small spades are made as toys for children. The "fishtail spade" has a flared triangular blade combining the versatility of the dutch hoe and power of the common round point shovel into a multipurpose tool. Loy ploughing. Loy ploughing was a form of manual ploughing carried out in Ireland using a form of spade called a loy. It was done on very small farms where horses could not be afforded or did  not have enough work, and on very hilly ground where horses could not work. It was used on poorer land until the 1960s. This suited the moist climate of Ireland as the trenches formed by turning in the sods providing drainage. It also allowed potatoes to be grown on mountain slopes where nothing else could be cultivated. Currency. The blade of the spade was used as currency in ancient China. Later, they were miniaturized and then stylized into a flat piece. The Qin Dynasty replaced them with round coins.