1. ("UIP") United International Pictures
2. A tiny TCP/IP stack written by Adam Dunkels, intended for 8 and 16 bit processors and microcontrollers. It's written in C, and when compiled it takes only a couple of kilobytes of memory for code, and a few hundred bytes for data. For example, at the moment, it takes 3372+392 bytes when compiled for 6502.
uIP is rather cool. For example, Dunkels has a Commodore 64 that acts as a web server (http://c64.cc65.org/), using only a SwiftLink module and a perfectly ordinary RS-232 cable (over which the data goes using SLIP protocol) in addition to normal C64.
(Perfect for concealed TCP/IP sniper rifles? =)