Saltire detected the symbol, which often appears with balls in the quadrants formed by the arms of the chi-cross, in standards that appear on the coins of Persepolis. She suggested that early Christians endorsed its solar symbolism as appropriate to Christ. She also wrote: "although it cannot be proved, ... in the white saltire of St. Andrew we still have a reminiscence of the old standard of the Persepolitan kingdom". In the old European Union standard, a black saltire set in an orange square is the hazard symbol for irritants (Xi) or harmful chemicals (Xn). It indicates a hazard less severe
Black and Yellow Building, One PNC Plaza, K&L Gates Center the Three Sisters and Smithfield Street bridges, Station Square, Shannon Hall of the Art Institute of Pittsburgh and the smoke stacks of the former U.S. Steel Homestead Works at The Waterfront adjacent to the city. The video also prominently features city icons such as the Terrible Towel, a rally towel for the Pittsburgh Steelers, and city sports in general, as well as Pittsburgh Pirates apparel. It was recorded in Chatsworth Avenue, Pittsburgh, PA. The official remix, "Black & Yellow (G-Mix)" features west-coast rapper Snoop Dogg, Juicy J and R&B singer T-Pain. Wiz Khalifa