USDZ
From Just Solve the File Format Problem
USDZ is a 3D content delivery format developed by Pixar. It consists of a ZIP format file (not using the compression and encryption features of ZIP) containing Universal Scene Description (USD, USDA, USDC) files, PNG or JPEG images and M4A, MP3, or WAV sound files.
Apple's implementations of USDZ only uses the USDC format within the package. USDC file can be at the root of the package or with a folder structure.