Bhatt	Bhattacharyya distance measure
C/S	Separability/Compactness
CH	Calinski–Harabasz
CVIs	Cluster validity indices
DB	Davies–Bouldin
DU	Dunn
KPD	Kernel-based probabilistic distance
PD	Probabilistic distance
PDF	Probability density function
RBF	Radial basis function
S/C	Compactness/Separability
UFSCH	Uncertain feature space CH
UFSDU	Uncertain feature space DU
UOSCH	Uncertain feature space CH
UOSDU	Uncertain feature space DU