Racing Flag Half Black
A diagonally divided black-and-white flag is displayed with a car number to indicate a penalty for unsportsmanlike conduct. This flag can be displayed if a car tries to intentionally drive another car off the course, or if a driver gets out of his or her car and initiates an altercation with another driver.
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Some administrators (NASCAR and IndyCar) do not distinguish mechanical problems or unsportsmanlike conduct from rules violations and simply use the solid black flag for all violations. Wikipedia