Flutter
Flutter may refer to:

Technology
Aeroelastic flutter, a rapid self-feeding motion, potentially destructive, that is excited by aerodynamic forces in aircraft and bridges
Flutter (American company), a gesture recognition technology company acquired by Google in 2013
Flutter (electronics and communication), any rapid variation of signal parameters
Flutter (software), an open source UI framework and SDK for building multi-platform apps

Medicine
"Heart flutter", an abnormally rapid heartbeat:
Atrial flutter, a common abnormal heart rhythm
Ventricular flutter, a tachycardia affecting the ventricles with a rate over 250-350 beats/min
Flutter valve, a one-way valve used in respiratory medicine to prevent air from travelling back along a chest tube

Arts and entertainment
Flutter (comics), a comic series

Music
Flutter-tonguing, a technique for playing wind instruments
Flutter, a 2001 album and a composition by Otomo Yoshihide's New Jazz Quintet
"Flutter", a song by Bonobo from his 2003 album Dial 'M' for Monkey
"Flutter", a song by Autechre from the 1994 EP Anti EP

Film
Flutter (2006 film), 2006 animated short by Howie Shia
Flutter (2011 film), 2011 film directed by Giles Borg

Other uses
Fluttershy, a My Little Pony character
Flutter Entertainment, an Irish-headquartered betting company
Flutter, a colloquial term for a small bet or wager in gambling
Flutter kick, a movement used in swimming or callisthenics

See also
Controlled aerodynamic instability phenomena
Wow and flutter measurement
Wow and flutter (disambiguation)