U
        
 
          ÜBERGOO: A related term to grey 
          goo, used (jokingly) to refer to the mistaken idea that during 
          the singularity powerful technologies 
          would decimate non-transhumanists, 
          and that some transhumanists would see this as desirable (which is clearly 
          against the Transhuman 
          Principles). [Dale Carrico 1996] 
        
UBIQUITOUS 
          COMPUTING: Also known as "embodied virtuality". Computers 
          that are an integral, invisible part of people's lives. In some ways 
          the opposite of virtual reality, in which the user is absorbed into 
          the computational world. With ubiquitous computing, computers take into 
          account the human world rather than requiring humans to enter into the 
          computer's methods of working. See Mark 
          Weiser, "The Computer for the 21st Century" Scientific 
          American Sept. 1991, Jim Morrison and Ubiquitous 
          Computing at Xerox Parc. 
        
 
          UPLIFT: To increase the intelligence and 
          help develop a culture of a previously non- or near-intelligent species. 
          [From the Uplift novels by David Brin] 
        
 
          UPLOAD: (a) To transfer the consciousness 
          and mental structure of a person from a biological matrix to an electronic 
          or informational matrix (this assumes that the strong 
          AI postulate holds). The term "Downloading" 
          is also sometimes used, mainly to denote transferring the mind to a 
          slower or less spacious matrix. (b) The resulting infomorph 
          person. For more information, see the Mind 
          Uploading Home Page or my upload page. 
          [The origin of the term is uncertain, but obviously based on the computer 
          technology term 'uploading' (loading data into a mainframe computer).] 
        
UPLOADER: 
          (a): A person advocating uploading. (b): a person 
          making an upload. 
        
 
          UNIVERSAL CONSTRUCTOR: A 
          machine capable of constructing anything that can be constructed. The 
          physical analog of a "universal computer", which can perform 
          any computation. 
        
UNIVERSAL 
          IMMORTALISM: The view that the problem of death can be solved 
          in its entirety (including bringing back those "dead" who 
          were not placed into biostasis) through 
          a rational, scientific approach. [R. Michael Perry, 1990] 
        
 
          UNIVERSAL TURING MACHINE: 
          A Turing machine 
          with a rule set which allows it to imitate any other Turing machine 
          (if the rule set and the input of the machine to be emulated are presented 
          on the tape). 
        
 
          UTILITY FOG: A collective of nanotechnological 
          devices ("Foglets") that link together into a complex network 
          in the air, able to work together to exert force in any direction or 
          transmit information between each other. This would give users almost 
          complete control over their environment. See Utility 
          Fog by J. Storrs Hall [J. Storrs Hall 1994]