A term used to describe a space containing three dimensions, such as the world we live in (provided we consider only spatial dimensions and not time; otherwise this is four space)
Another common name for three space is R3.
This is most commonly employed in comparison - a line that exists in two dimensions would be "a line in R2" (regular Cartesian co-ordinates), whereas "line in R3" would be a line that exists in three space.
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