hexaster

例句：

1. 1. The hexagon is a shape with six sides and six angles.
   这个六边形是一个有六个边和六个角的形状。
2. 2. The hexagon was used in ancient times as a symbol of unity.
   古代，这个六边形用作团结的象征。
3. 3. The hexagon is often found on the top of buildings to add stability.
   这个六边形通常出现在建筑物的顶部，以增加稳定性。