Group
![](http://static.miraheze.org/looneypyramidswiki/thumb/7/7c/Three-pyramid-group.png/240px-Three-pyramid-group.png)
A piece is said to be part of a group if it is touching any of the other pieces in that group. For instance, let's say a red piece is touching both a blue piece and a green piece, but the blue and green aren't touching. Those pieces make up a three-piece group.
A piece that is touching no other pieces makes up a one-piece group and is sometimes affectionately known as a hermit.