Nevada has had four different flags since being admitted into the Union in 1864, during the Civil War. This is the most current one, adopted in 1991. The words “Battle Born” on the banner reflect the fact that Nevada became a state in wartime. The silver star commemorates Nevada’s state mineral, which is silver (even despite the large amounts of gold mined there in the 1800s.) The two vines are sagebrush, which is Nevada’s state flower.
Information from http://www.netstate.com/states/symb/flags/nv_flag.htm. Image from Google.