1 Either an acute injury near the nail or anything that causes the nail to be damaged repetitively (such as playing soccer) can also cause an ingrown nail.  If a member of your family has an ingrown toenail, then you are more likely to develop one, too.
The troy ounce (symbol and abbreviation: ozt) is a non-SI unit of mass commonly used to gauge the weight of precious metals. One troy ounce (ozt) = 31.1034768 grams (g) = 1.09714286 ounces (oz) = 480 grains (gr).
So how do we get lb for pound and oz for ounce? Lb is an abbreviation of the Latin word libra. We got the word pound in English from the pondo part of the libra pondo but our abbreviation comes from the libra. The libra is also why the symbol for the British pound is Â£ â an L with a line through it. The Italian lira also used that symbol (with two lines through it), the word lira itself being a shortened version of libra. Ounce is related to the Latin uncia, the name for both the Roman ounce and inch units of measurement.