Flex

Flex, the act of deforming elastically and returning to the original shape when the applied stress is removed

Flex or FLEX may also refer to:

Computing

Adobe Flex, technologies for developing rich internet applications
Flex, a family of automatic test equipment produced by Teradyne
Flex lexical analyser, a free software alternative to lex
Flex machine, multiple systems
FlexSystem, enterprise solution developer in Hong Kong
FLEX (operating system), a single-tasking operating system for the Motorola 6800
FLEX (protocol), a communication protocol for pagers
FLEX (SIL FieldWorks Language Explorer), an open source application for linguists developed by SIL International

Copper-coated polyamide film, often used in flexible printed circuits
A common shortening of flexible cable, as used on electrical appliances
Femtosecond Lenticule EXtraction, a form of refractive eye surgery
Flex-Elektrowerkzeuge, a German producer of power tools
Flex-fuel, a Flexible-fuel vehicle
FLEX mission, a potential satellite launch mission by the European Space Agency
Flextronics (NASDAQ symbo: FLEX), a contract electronics maker in Singapore
Ford Flex, a full sized people mover vehicle
Frequency Level Expander, a Pioneer Corporation tape enhancement feature
Reduced flex thrust, a reduced takeoff thrust setting which trades excess performance for reduced engine wear
Flex and flock are synthetic materials which can be cut and thermo transferred onto t-shirts

Flex is shorthand for Flex Your Rights a civil-liberties non-profit based in Washington DC.
Flexion, in anatomy, a position made possible by the joint angle decreasing
Flex Linhas Aéreas, a Brazilian regional airline
Fleet Landing Exercises, acronym for "Fleet Landing Exercise", a series of landing exercises conducted by the Fleet Marine Force, a combined-United States Navy/Marine landing force
Future Leaders Exchange, acronym for "Future Leaders Exchange", an American student exchange program for high school students from the former Soviet Union