NPZ is a binary file format for storing data from the NumPy Python package.

The general-purpose commands Import and Export support this format.

$\mathrm{Import}\left(''example/address.npz''\,\mathrm{base}=\mathrm{datadir}\right)$

$\left[\begin{array}{cc}''address''& table\left(\left[''country''=''Canada''\,''postalCode''=''N2V\; 1K8''\,''province''=''ON''\,''streetAddress''=''615\; Kumpf\; Drive''\,''city''=''Waterloo''\right]\right)\\ ''founded''& 1988\\ ''companyName''& ''Maplesoft''\\ ''phoneNumbers''& \left[\begin{array}{c}table\left(\left[''type''=''local''\,''number''=''+1\; (519)\; 747-2373''\right]\right)\\ table\left(\left[''type''=''tollfree''\,''number''=''+1\; (800)\; 267-6583''\right]\right)\\ table\left(\left[''type''=''fax''\,''number''=''+1\; (519)\; 747-5284''\right]\right)\end{array}\right]\end{array}\right]$

numpy.lib.format, https://numpy.org/devdocs/reference/generated/numpy.lib.format.html, NPY format.