1:1
1:1 may refer to:
1:1 scale
1:1 correspondence, the same as a set-theoretical bijection
1:1 line in a 2-dimensional Cartesian coordinates
1:1 aspect ratio (image), the square format
1:1 pixel mapping
1:1 (film), an animated film by Richard Reeves (2001)
One to one computing (education)
Koenigsegg One:1, a model of the Koenigsegg Agera sports car
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