007

 is a nickame given to George O'Malley.

History
The real 007 is a movie character named James Bond who is called Agent 007 and he has a license to kill.

In A Hard Day's Night, George was asked to assist in an apendectomy and almost killed the patient, getting him the nickname 007.

In Now Or Never, he was hit by a bus and left unrecognisabel, to let Meredith knowe who he was, he wrote "007".