Screen shot from the wikipedia page for the associahedron, showing an image I made that is featured there. This image shows the front half, with vertices labeled by bracketings of the five letters a through e. Arrows for single re-associations connect the vertices.
https://media.mathstodon.xyz/media_attachments/files/108/199/165/738/627/221/original/e48b9c7134cba8c1.png