Nano Seconds: NS for short, nano seconds refer to the speed of RAM. By looking at the last numbers usually right after a dash (-), it gives the timing fo the RAM. When refering with SDRAM, DDR or RDRAM, there sometimes are two numbers. A -75 doesn't mean 75 ns, it means 7.5 ns.
NAT: Network Address Translation - A method used by firewalls to keep a network behind under just one IP address for security reasons.
Nerd: Believed to originate from the slang term nert or nuts, the word first turns up in print in the 1950's classic "If I ran the zoo" but Dr. Seuss. Seuss, FTW!
NetBEUI: Network BIOS Enhanced User Interface - IBM developed this standard protocol, which is a set of rules that an operating system uses to control how computers on a network to talk to each other. This protocol is now also used by Microsoft and Novell on many network operating systems including LAN Server, LAN Manager, Windows NT, and Windows 95.
Netbook: A very small laptop with a solid state drive rather than a hard drive and no cd drive. Designed mostly for surfing the internet with very nominal software features.
Newbie: A term for a person who is new to the given subject/topic.
NIC: Network Interface Card - Network cards connect to local area networks via ethernet cables or some other means of connectivity to bring computers together electronically.