Elon Musk ignited speculation and chatter online when he made a hand gesture twice during a speech celebrating President Donald Trump on Monday. Speaking at a celebratory rally at the Capital One Arena in Washington hours after Trump was sworn in as president, Musk thanked the crowd for choosing Trump during “a fork in the road of human civilization.” Musk, who leads Tesla, SpaceX and the social media platform X, and who backed Trump last year during his presidential campaign, added, “I just want to say thank you for making it happen — thank you.” The billionaire then grunted and...