VIC stands for Validity Index using supervised Classifiers [1].
[1] J. Rodríguez, M. A. Medina-Pérez, A. E. Gutierrez-Rodríguez, R. Monroy, H. Terashima-Marín, "Cluster validation using an ensemble of supervised classifiers," Knowledge-Based Systems, vol. 145, pp. 134-144, 2018. (Q1, IF: 5.101)