Gizmo
A gizmo is a gadget, especially one whose real name is unknown or forgotten.
Gizmo may also refer to:

Technology
The Gizmo or "Gizmotron", an effects device for electric guitars
Gizmo key, found on certain flutes
Gizmos, interactive online simulations for math and science education from ExploreLearning
Gizmo, a 1996-2001 digital game distribution platform by Mplayer.com
Goodyear GA-400R Gizmo, a one-man helicopter introduced in 1954

Entertainment
The Gizmos, a 1970s proto-punk band
Gizmo, a band formed in 2005 by Stewart Copeland
"Gismo My Way", B-side to the 1974 single "The Wall Street Shuffle" by 10cc
Gizmo!, a 1977 documentary film about inventions
Gizmo, a 1999 play by Sir Alan Ayckbourn
The Gizmo, a book series by Paul Jennings
Gizmo (DC Comics), a character in the Teen Titans animated series
Gizmo (Mirage Studios), a 1986 comic book series
Gizmo Duck, a character in the DuckTales series
Gizmo, a character in the Gremlins films
Don Gizmo, a character in the Fallout computer game
Gizmo, a character in the comic strip Beetle Bailey
Professor Gizmo, a character in the TV cartoon The Ruff and Reddy Show
A Super Mario Maker 2 category of objects
War with the Gizmos, a 1958 novel by Murray Leinster

Other uses
Gizmo Williams (born 1962), former Canadian Football League player

See also
Gizmo5, a peer-to-peer internet telephony and instant messaging software application
Gizmodo, a technology website
Gizmondo, a handheld gaming console