Barack Obama has done it. So have Oprah Winfrey, Ronald Reagan, Malcolm of “Malcolm in the Middle” and Beyoncé. But flashing the OK hand signal, in which the thumb and index fingers form a ...

Barack Obama has done it. So have Oprah Winfrey, Ronald Reagan, Malcolm of “Malcolm in the Middle” and Beyonce. But flashing the OK hand signal, in which the thumb and index fingers form a ...