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).
The abbreviation cwt stands for hundredweight. Unfortunately there are two different definitions of a hundredweight. In the United Kingdom, where it has been replaced by the metric system, a hundredweight is 112 pounds, or 8 stone. In the United States, it is 100 pounds. Carol Buchholz Slack.