Or you could simply call it what it is -- a firewall -- since that's what most consumers think NAT is anyways.
While I disagree with the general sentiment that NATs create security, the standard usage of such devices is certainly that of a stateful firewall.
All hairsplitting aside, given that the term NAT these days is mostly used in a PAT (particularly in a customer connecting to the I) context, what isn't secure about? ***** "The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential, proprietary, and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from all computers.61"