The second type, a use variance, allows the property owner to use his property in a way that deviates from local zoning standards. It is an exception to the regulations governing the use of the property. For example, a use variance might allow a dentist to place his office in a residential neighborhood. Process for Approval of a Variance
Most of the trans fat in the foods we eat is formed through a manufacturing process that adds hydrogen to vegetable oil, which converts the liquid into a solid fat at room temperature. This process is called hydrogenation.
In summary, it probably isn't the fact that a fat has a trans configuration in and of itself that is the problem. Rather, hydrogenated fats, which happen to have a trans configuration, have a negative impact on health. Trans fats has become a shorthand for this type.