Complex type numbers
In the Huygens Software, 2×32-bit complex type is one of the number representations used by the Huygens Compute Engine to describe VoXels intensities in an image (actually, complex numbers are used in images that are Fourier Transforms of real intensity distributions, like in Optical Transfer Functions).
Complex numbers are therefore represented by usign two Float Type numbers, one for the real part and another one for the imaginary part.
See the overview for all Huygens Data Types.
How it is used in Huygens see File-formats