Origin of SLRs(ingle) l(ens) r(eflex)
slr - Computer Definition
(1) (Scalable Linear Recording) A line of magnetic tape drives from Tandberg Data that evolved from the QIC Data Cartridge format. See QIC.
(2) (Single Lens Reflex) A camera that uses the same lens for viewing and shooting. A mirror reflects the image from the lens to the viewfinder. When the shutter button is pressed, the mirror flips out of the way and the shutter opens to expose the film. See DSLR, mirrorless camera and film camera.