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The NASA astronaut pin is a lapel pin, worn on civilian clothing. The pin is issued in two grades, silver and gold, with the silver pin awarded to candidates who have successfully completed astronaut training and the gold pin to astronauts who have actually flown in space. [Wikipedia]

In the image below, the golden pin can be seen worn by Buzz Aldrin, LEM-pilot on Apollo 11 and the second man to set foot on the moon.