Ok I think it means that there USA form of a sculpture
<em>hi</em><em>!</em><em> </em><em>im</em><em> </em><em>chimken</em><em> </em><em>and</em><em> </em><em>i</em><em> </em><em>have</em><em> </em><em>your</em><em> </em><em>answers</em><em>!</em>
answer: finding your style can be really hard! but you should look at other people's styles and make a combination of theirs! also, don't be afraid to take inspiration of other people's art!
<em>i</em><em> </em><em>hope</em><em> </em><em>i</em><em> </em><em>helped</em><em>!</em><em>!</em><em> </em><em>^</em><em>^</em>
If you are talking about arks for construction, the answer would be "The point or line at which an arch or vault begins to curve".