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Przykłady: lamer, wannabee, geek, 404, 0, Zork.
u-, UBD, UBE, ubergeek, UCE, UDP, UN*X, undefined external reference, under the hood, undocumented feature, uninteresting, Unix, Unix brain damage, Unix conspiracy, Unix weenie, unixism, unswizzle, unwind the stack, unwind-protect, up, upload, upstream, upthread, uptime, urchin, URL, Usenet, Usenet Death Penalty, user, user-friendly, user-obsequious, userland, Utah teapot, the, UTSL, UUOC