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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.

::M ::S ::L ::SML ::LMS
A trio of multiple colors A red tree A blue nest

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.


The term is first used in the rules for Treehouse.