BALQSO

• Broad Absorption Line QSO

• BI Balnicity_Index (Weymann et al. 1991)

The balnicity index BI of the quasar, BI is a modified equivalent width of the CIV BAL, being the sum of the 'modified equivalent widths' of the portions of all contiguous BAL troughs between 3,000 and 25,000 km/s shortward of 1549 Angstroms

• low-ionization BALQSOs (LoBALs)