2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/64378We introduce a monoid structure on a certain set of labelled binary trees, by a process similar to the construction of the plactic monoid. This leads to a new interpretation of the algebra of planar binary trees of Loday-Ronco.4 pages, LaTex, FrenchCombinatoricsAn analogue of the plactic monoid for binary search treestext