WABAC

The WABAC Machine or Wayback Machine is a fictional time machine from the segment "Peabody's Improbable History", a recurring feature of the 1960s cartoon series The Rocky and Bullwinkle Show.

The Rocky and Bullwinkle Show
The WABAC machine was a central element of the "Peabody's Improbable History" cartoon segment. The machine was invented by Mr. Peabody, a genius, polymath, and bow tie-wearing beagle, as a birthday gift for his adopted pet boy, Sherman. By allowing them to visit famous historical people or events, the WABAC provided educational adventures for Sherman.The machine apparently later returned Mr. Peabody and Sherman to the present, although the return trip was never shown. The segment traditionally ended with a pun.

Either of the names WABAC or Wayback are in common usage, with the term "WAYBACK" explicitly indicated during the segment in which Mr. Peabody and Sherman visit the "Charge of the Light Brigade". The precise meaning of the acronym WABAC is unknown. According to Gerard Baldwin, one of the show's directors, the name "WABAC" is a reference to the UNIVAC I.

Mr. Peabody and Sherman film (2014)
The movie studio DreamWorks Animation announced in 2006 and again in 2012 that they were creating an animated movie entitled Mr. Peabody & Sherman, which was released March 7, 2014. The WABAC machine is a central element to the plot. In the movie, the acronym is revealed to be Wavelength Acceleration Bidirectional Asynchronous Controller (WABAC).