Musk then slapped his chest with his right hand, before flinging it diagonally upwards, palm face down. He turned around to audience members behind the podium, and repeated the gesture. “My heart goes out to you,

Elon Musk’s use of an arm gesture that distinctly resembled a Roman salute, a greeting arguably best known for its use among members of the Nazi Party, generated confusion and concern as the billionaire tech entrepreneur delivered remarks at an inaugural celebration at Capital One Arena in Washington.