Left and right as physical relative directions in terms of an observer (e.g. turning left)
Left and right as designating different chiralities, independent of an observer (as in left glove, left-eyed flatfish, left-handed screw threads, etc.)
Left and right, roles of unities or identity elements in mathematics
Sinistral and dextral, the Latin names of left and right, used in science and heraldry
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