What does HiBALs stand for? Definition from Weymann et al. 1991

High-Ionization Broad Absorption Line Quasars, or 'HiBALs' for short, are a type of quasar defined by Weymann et al. in 1991. These quasars are characterized by the presence of broad absorption lines in their spectra, which are attributed to highly ionized atoms. The discovery of HiBALs has been significant for our understanding of the properties and environments of quasars. They provide insights into the physical processes occurring in the vicinity of supermassive black holes and the nature of the gas surrounding these objects.