Stereological methods are widely used in modern research. An essence of the stereological analysis is to obtain the information on geometrical properties of three-dimensional (3D) objects by their representations of restricted dimensionality, i.e., by stereological probing profiles. A typology of stereological probing variants is briefly presented. An essence and peculiarities of practical application of such useful probes as arbitrary (AUR), isotropic (IUR), vertical (VUR) uniform random probes of various dimensionality (0D, 1D, 2D...), PSI (point sampled intercept), disector, orthogonal triplet, and spherical probe, are also examined. The stereological probing variants are illustrated with examples taken from recent research. The materials presented can be employed in further investigations in biomedicine.