In House M.D., Remy Hadley's nickname is “Thirteen.”
Remy Beauregard Hadley is a physician who joins House's diagnostic team during the series' fourth season. Olivia Wilde plays the character, whose nickname comes from the number assigned to her during the competitive selection process House uses to choose new fellows.
The nickname remains even after the selection process ends. It becomes the name by which colleagues commonly identify her, while “Remy” is her first name. Thirteen is a talented doctor whose personal history, bisexuality, and Huntington's disease diagnosis become important parts of her storyline.
The character is often confused with the other applicants who briefly appear during season four's team competition. Those doctors receive numbers as part of House's elimination process, but only Hadley becomes widely known by one of those numbers. “Thirteen” therefore refers specifically to Hadley, not to Olivia Wilde or to a medical department.