Made and used by the Egyptians, Hebrews, and other early races. In the Revelation of John, it is an emblem of brightness (Rev. 4: 6; Rev. 15: 2; Rev. 21: 18). The "glass" mentioned in the N.T. as an instrument for reflection (1 Cor. 13: 12; 2 Cor. 3: 18; James 1: 23) was a mirror made of polished metal.