title: Yellow flag
text: # Yellow flag
  
  Yellow flag may refer to:
  
  * Iris pseudacorus, an aquatic flowering plant
  * A flag of a yellow colour:
     * Yellow flag (contagion), historically displayed on ships to indicate the presence of disease or quarantine (obsolete); also used in some cities to mark a recent death in a neighborhood, regardless of cause
     * Racing flags, used in motor sports to indicate hazardous conditions
     * Penalty flag, used in various sports including American football
     * Yellow Flag Line, transport on the Chao Phraya River, with service indicated by the flag color
     * Yellow Dragon Flag, the flag of the Qing dynasty
  * The Yellow Flag, 1937 German drama film
  * Yellow Banners of the Eight Banner system
     * Plain Yellow Banner
     * Bordered Yellow Banner
  