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Software and hardware that already exists and is available from commercial sources. It is also referred to as off-the-shelf.
NIST SP 800-161 under Commercial off-the-shelf (COTS) from NIST SP 800-64 Rev. 2
NISTIR 7622 under Commercial off-the-shelf from NIST SP 800-64 Rev. 2
A software and/or hardware product that is commercially ready-made and available for sale, lease, or license to the general public.
CNSSI 4009-2015 from
Hardware and software IT products that are ready-made and available for purchase by the general public.
NISTIR 7711 under Commercial-Off-The-Shelf