The Jargon File (version 4.4.7, 29 Dec 2003):

microLenat
 /mi:`?kroh?len'?@t/, n.

    The unit of bogosity. Abbreviated ?L or mL in ASCII Consensus is that
    this is the largest unit practical for everyday use. The microLenat,
    originally invented by David Jefferson, was promulgated as an attack
    against noted computer scientist Doug Lenat by a tenured graduate student
    at CMU. Doug had failed the student on an important exam because the
    student gave only ?AI is bogus? as his answer to the questions. The slur is
    generally considered unmerited, but it has become a running gag
    nevertheless. Some of Doug's friends argue that of course a microLenat is
    bogus, since it is only one millionth of a Lenat. Others have suggested
    that the unit should be redesignated after the grad student, as the
    microReid.


The Free On-line Dictionary of Computing (30 December 2018):

microLenat

   /mi:"-kroh-len"-*t/ The unit of bogosity, written uL; the
   consensus is that this is the largest unit practical for
   everyday use.  The microLenat, originally invented by David
   Jefferson, was promulgated as an attack against noted computer
   scientist Doug Lenat by a tenured graduate student at
   CMU.  Doug had failed the student on an important exam for
   giving only "AI is bogus" as his answer to the questions.  The
   slur is generally considered unmerited, but it has become a
   running gag nevertheless.  Some of Doug's friends argue that
   *of course* a microLenat is bogus, since it is only one
   millionth of a Lenat.  Others have suggested that the unit
   should be redesignated after the grad student, as the
   microReid.

   [Jargon File]