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Ryan FR Fireball, a mixed-power US Navy fighter aircraft •
Flame retardant •
Flash release, a technique used in wine pressing •
Francium (symbol Fr), a chemical element •
Franklin (unit) (Fr), a unit of electrical charge •
Front-engine, rear-wheel-drive layout, of an automobile design •
Froude number (), in physics • Front Right (FR), one of the speakers in
5.1 surround sound Biology and medicine •
French catheter scale, a scale for medical catheters •
Elias Magnus Fries (1794–1878; author abbreviation Fr.), Swedish mycologist and botanist
Computing •
.fr, the Internet country code top-level domain for France •
Fujitsu FR (Fujitsu RISC), a microprocessor • fr-, product code prefix used by
Farbrausch, e.g. fr-019 •
Full Rate, a speech coding standard used in GSM •
Adobe Fresco, an Adobe software ==Publications==