2x4

2x4 may refer to:
* Dimensional lumber, a common size, approximate dimension is 1 1/2 × 3 1/2 inches.
* two by four, A length of sawn wood of cross section 2 inches by 4 inches, most often employed as structural framing lumber (dimension or dimensional lumber). (From http://en.wiktionary.org/wiki/two_by_four)
* "2X4 (Guadalcanal Diary album)" (1987) by Guadalcanal Diary
* "2X4 (Einstürzende Neubauten album)" (1984) by Einstürzende Neubauten
* "2by4", a 1998 film by Jimmy Smallhorne
* "2 X 4", a song by Metallica from their album Load (1996)
* "2 by 4" is a "secret menu" item at In-N-Out Burger.
* "2 x 4" is a 1984 song by The Fall
* "2X4" is a song by Blind Melon from the "Soup" album.
* the Argentine Tango musical genre, with reference to the genre's characteristic $2\; atop\; 4$ time signature.