One day, the signature of Treasury Secretary Jack Lew will appear on every U.S. dollar. But first, he needs a signature that fits the bill.

"XOXO" has long been the symbol for a kiss and a hug, but a pair of writers say that it's commonly becoming used as a way to sign-off an email message — even at the workplace. How does your digital sign-off affect how others perceive you at the office?

A new study says big signatures are evidence of narcissism, which in the executive capacity can be detrimental to corporate health.