B.R.
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
An abbreviation for B ancus Reffis, (King's Bench,) or Bancus Reginœ, (Queen's Bench.) It is frequently found in the old books as a designation of that court In more recent usage, the initial letters of the English names are ordinarily employed, i. e., K. B. or Q. B.