Weather front areas of precipitation help determine the frontal type and location. There are two different meanings used within meteorology to describe weather around a frontal zone. The term "anafront" describes boundaries which show instability, meaning air rises rapidly along and over the boundary to cause significant weather changes. A "katafront" is weaker, bringing smaller changes in temperature and moisture, as well as limited rainfall. A cold front is located at the leading edge of the temperature drop off, which in an isotherm analysis shows up as the leading edge of the isotherm gradient, and it normally lies within a sharp surface
Letter of marque were sometimes used to describe the vessels used to pursue and capture prizes. In this context, a letter of marque was a lumbering, square-rigged cargo carrier that might pick up a prize if the opportunity arose in its normal course of duties. In contrast, the term privateer generally referred to a fast and weatherly fore-and-aft rigged vessel, heavily armed and heavily crewed, intended exclusively for fighting. Marque derives from the Old English "mearc", which is from the Germanic *"mark-", which means boundary, or boundary marker, which is derived from the Proto-Indo-European root "*merǵ-", meaning boundary, or border. The French "marque"