A ternary tree is a tree-like structure that is rooted and in which each vertex has at most three children.
Ternary Tree
See also
Binary Tree, Complete Ternary TreePortions of this entry contributed by David Terr
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Cite this as:
Terr, David and Weisstein, Eric W. "Ternary Tree." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/TernaryTree.html