(2+1)-dimensional quantum gravity (defined in quantum geometry)

2-category

2-category of double groupoids

2-C*-category

2D FFT (defined in two-dimensional Fourier transforms)

2D Fourier transforms (=two-dimensional Fourier transforms)

2D FT (defined in two-dimensional Fourier transforms)

2D-FT MR- Imaging and related Nobel awards

2D Laplace transform (defined in table of Laplace transforms)

2D-LT (defined in table of Laplace transforms)

2D-projection (defined in ballistics (2D))

2D quantum tomography (=2D-FT MR- Imaging and related Nobel awards)

2-groupoid (defined in n-groupoids)

2-groupoid (defined in n-groupoid)