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

NLX

    A low-profile, low TCO motherboard
   design created jointly by Intel Corp., IBM, DEC and
   other PC vendors.  In contrast to the traditional single-board
   design, NLX uses a riser card to carry PCI, ISA and
   AGP bus data (despite Intel's stated intent to rid PC
   motherboards of the ISA bus by 2000).

   Version 1.2 of NLX is the final specification, and was frozen
   in March 1997.  Minor modifications appear in the form of
   "Engineering Change Requests".

   (http://teleport.com/~nlx/).

   Intel (http://intel.com/design/motherboard/nlx.htm).

   ["NLX Motherboard Specification", various, pub. Intel Corp. 1997]

   (1998-09-21)