After billionaire Elon Musk performed not one but two Nazi salutes at president Donald Trump's inauguration, made appalling jokes about the Holocaust, and then threw his weight behind Germany's far-right political party,

A gesture associated with the Nazis has a surprising history. But in Germany, there was little doubt about its meaning.

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,