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NOAA National Oceanic Atmospheric Administration
NOC Network Operations Center
.NOM Individual with Personal Site (Domain Name) [Internet]
NOP No Operation
NOPAC Network OPAC
NOR Not Or
NOS Network Operating System
NPA Network Printer Alliance + Numbering Plan Area
NPI Network Printer Interface
NPL Nonprocedural Language
NPN Negative Positive Negative (bipolar transistor)
NPS Novell Productivity Specialist [Novell]
NPT Non-Programmable Terminal
NPTN National Public Telecomputing Network
NPU Natural Processing Unit
NPX Numeric Processor Extension
NQS Network Queuing System [Cray]
N(r) Number Returned
NRC National Research Council (Canada)
NREN National Research and Education Network
NRM Network Resource Manager + Normal Response Mode
NRZ Not Return to Zero
NRZI Non Return to Zero Inverted
NS Nanosecond (one-billionth of a second) +
National Semiconductor (as in Ns16550 UART) +
annaabi.ee 
