dendrogram

https://doi.org/10.1351/goldbook.10122

Tree diagram used to illustrate the arrangement of clusters produced by hierarchical clustering.

Note: The objects are successively grouped (or un-grouped) in each layer of the dendrogram, where the length of the linking lines is proportional to the dissimilarity of the objects.
Source:
PAC, 2016, 88, 407. (Vocabulary of concepts and terms in chemometrics (IUPAC Recommendations 2016)) on page 428 [Terms] [Paper]