and in the a trous wavelets GUI it’s “plans”
Siril command line
wavelet nbr_plan type
Computes the wavelet transform on nbr_plan plans using linear (type=1) or bspline (type=2) version of the ‘à trous’ algorithm. The result is stored in a file as a structure containing the planes, ready for weighted reconstruction with WRECONS
wrecons c1 c2 c3 …
Reconstructs to current image from the planes previously computed with wavelets and weighted with coefficients c1, c2, …, cn according to the number of planes used for wavelet transform
in the English language these two words have totally different meanings.