Trio
A Trio is a set of three pyramids, one small, one medium, and one large. They may or may not be of the same color; if they are, it is a monochrome trio.
| A trio of multiple colors | ||
| A blue nest |
| A red tree |
There are terms for two special arrangements of a trio: if stacked smallest to largest, it is a nest; if stacked largest to smallest, it is a tree.
History
The term is first used in the rules for Treehouse.