Noun
English Wikipedia has an article on:NSAP addressWikipedia
NSAP address (plural NSAP addresses) (abbreviated as: NSPA)
(Internet) An identifying label for network endpoints used in OSI networking
A Network Service Access Point address (NSAP address), defined in ISO/IEC 8348, is an identifying label for a Service Access Point (SAP) used in OSI networking. Source: Internet
NSEL The NSEL (Network-Selector) is a field in the NSAP address that identifies the network layer service to which a packet should be sent. Source: Internet