  Since the first detection of intracluster planetary nebulae in 1996, imaging
and spectroscopic surveys identified such stars to trace the radial extent and
the kinematics of diffuse light in clusters. This topic of research is tightly
linked with the studies of galaxy formation and evolution in dense environment,
as the spatial distribution and kinematics of planetary nebulae in the
outermost regions of galaxies and in the cluster cores is relevant for setting
constraints on cosmological simulations. In this sense, extragalactic planetary
nebulae play a very important role in the near-field cosmology, in order to
measure the integrated mass as function of radius and the orbital distribution
of stars in structures placed in the densest regions of the nearby universe.
