401 (disambiguation)

401 may refer to:

401 (number), the natural number following 400 and preceding 402 A year: 401 BC or AD 401 Ontario Highway 401, a highway that extends across Southern Ontario, Canada There are also other roads named 401, see the List of highways numbered 401 401(a), a type of U.S. tax-deferred retirement savings plan defined by a subsection of the Internal Revenue Code 401(k), a type of U.S. employer-sponsored retirement plan defined by a subsection of the Internal Revenue Code Titanic The hull number for RMS Titanic Bristol 401, a car produced by Bristol Cars in the early 1950s HTTP 401, a status in the HTTP protocol indicating authentication has failed .401 Winchester Self-Loading centerfire rifle cartridge introduced in 1910 Area code 401, NANP area code that serves the entire state of Rhode Island Cessna 401, an airplane Peugeot 401, a family car "401", a storyline in the science fiction comedy webtoon series Live with Yourself!

See also 401st (disambiguation)