2741. Unicode and Lisp
      Random ramblings on Unicode
2742. Unicode Support
      All contemporary Lisp implementations have reasonable Unicode support
2743. unification
      Libraries adding unification operations to Common Lisp
2744. unistd-stream
      A cl-stream stream using cffi-posix unistd semantics
2745. unit-conversion
      units is an extensive measuring unit (time/weight/distance/etc and many other physical units) conversion library
2746. unit-formula
      unit-formula is a library for units conversions and defining formulas with automated unit consistency checking and conversions
2747. unit-test
      unit-test is a Test Framework by Alain Picard
2748. Units
      Things dealing with time, date, weight, currency, etc
2749. Universal-Config
      This library tries to provide a layer for configuration files and storage that should be able to map any type of object to any configuration format and back
2750. Unix
      Pages on CLiki that may help with closer integration of CL and Unix :

CLiki the common lisp wiki