House flag of BRT
B.R.T.(Belgische Rijn Transit - Belgian Rhine Transit) was a Belgian inland shipping company.
The house flag of BRT (photo, Binnenvaart website), is made of the Belgian national colors black-yellow-red ordered diagonally, ascending, with the company's initials "B.R.T." in black in the central stripe, in ascending order also, but placed so as to read horizontally.