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 LOGICAL [from the technical term "logical device", wherein
       a physical device is referred to by an arbitrary name] adj. Understood
       to have a meaning not necessarily corresponding to reality. E.g., if a
       person who has long held a certain post (e.g., Les Earnest at SAIL)
       left and was replaced, the replacement would for a while be known as
       the "logical Les Earnest". The word VIRTUAL is also used. At
       SAIL, "logical" compass directions denote a coordinate
       system in which "logical north" is toward San Francisco,
       "logical west" is toward the ocean, etc., even though
       logical north varies between physical (true) north near SF and
       physical west near San Jose. (The best rule of thumb here is that El
       Camino Real by definition always runs logical north-and-south.) 



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