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Meanings and definitions for 3RS

The three Rs, a widely used abbreviation for the basic elements of a primary school curriculum: reading, 'riting (writing), and 'rithmetic (arithmetic)
The three Rs, a widely used abbreviation for the waste management hierarchy: reduce, reuse, and recycle
The Three Rs (animals), principles for ethical use of animals in testing: replacement, reduction, refinement
3R (optical regenerator), an optical communications repeater that performs reamplification, reshaping, and retiming
Intelsat 3R, a former communications satellite
Yaesu VX-3R, an ultra-compact dual band amateur radio transceiver
British Rail Class 206, Southern Region designation 3R from 3-car Reading Line stock
3R (print size), a standard consumer print size for photographs
The 3Rs of Junior Forest Wardens (a Canadian outdoor-education program for families): Responsibility to yourself, Responsibility to others, Responsibility to your community and the planet