https://www.cnbc.com/2018/05/07/why-jeff-bezos-still-reads-the-emails-amazon-customers-send-him.html

When Jeff Bezos wants to call his team's attention to a customer complaint, the Amazon founder and CEO forwards the email directly to his executives, with a note that consists of a single character: "?"

"That question mark is just a shorthand for, 'Can you look into this? Why is this happening? What's going on?'" says Bezos, speaking to the George W. Bush Presidential Center's Forum on Leadership in April.