Jack Lew was the senior budget adviser to Presidents Barack Obama and Bill Clinton. He was Obama's chief of staff. Now he is Treasury secretary.

But his most remarked-upon trait was his unusual signature, a series of eight connected loops that looked more like a doodle than a signature that should grace the U.S. currency. If one had to guess the name, word or, more accurately, sound represented by his old autograph, it would simply be "Oooooooo."

On Tuesday, that all changed. The Treasury unveiled Lew's new signature, which will be on the $5 bill this fall and other currency as it is issued over the years. Lew had promised Obama that he would sign his name more legibly as a condition of his nomination.