Have you met Rotus?

This is a question President Obama has taken to asking some of his visitors to the White House. In a bureaucratic world awash in abbreviations and acronyms, this one in particular seems to amuse him.

Mr. Obama, of course, is Potus (president of the United States). Michelle Obama is Flotus (first lady of the United States). And the title of Rotus (receptionist of the United States) is worn by Darienne M. Page.

“This is the receptionist of the entire United States,” Mr. Obama said, introducing Ms. Page to Attorney General Eric H. Holder Jr.