Abstract
Loday and Ronco introduced the notion of a trioid and presented the free trioid of rank 1. We introduce the variety of left (right) n-trinilpotent trioids which are analogs of left (right) nilpotent semigroups of rank n considered by Schein, and construct the free left (right) n-trinilpotent trioid.
Acknowledgment
The authors are grateful to the referee for helpful suggestions.