Non-Programmable Terminal. IBMspeak for dumb(ish) terminals such as the 3270 and 5520 families. IBM also uses the terms dependent workstation, NWS, and MFI with the same meaning. There is a version of the SAA user interface ( CUA 1) for NPT workstations.
Non Proliferation Treaty. A treaty theoretically designed to prevent the spread of nuclear weapons to countries other than the "Big 5", U.S., Russia, Great Britain, France and China. In practice, it had little effect.