why is the glasgow derby called the old firm
Old Firm The origin of the term is unclear but may derive from the two clubs' initial match in which the commentators referred to the teams as "like two old, firm friends",[9] or alternatively may stem from a satirical cartoon published in a magazine prior to the 1904 Scottish Cup Final between the sides, depicting an elderly man with a sandwich board reading "Patronise The Old Firm: Rangers, Celtic Ltd", highlighting the mutual commercial benefits of their meetings.[10][11] The name may also be a reference to these two teams being among the original 11 members of the Scottish Football League formed in 1890.[12]