Teich is a term that can refer to a small body of water, often a pond or a lake, typically found in natural settings. These water bodies can support various forms of wildlife and plant life, making them important ecosystems. They can also serve recreational purposes, such as fishing or birdwatching. In a different context, Teich can refer to Teichmüller theory, a branch of mathematics that studies the geometry of surfaces. This theory is named after the mathematician Oswald Teichmüller, who made significant contributions to the understanding of complex structures on surfaces.