V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

WLL
       Wireless Local Loop


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

Wireless Local Loop
fixed-radio access
FRA
radio in the loop
RITL
WLL

    (WLL, radio in the loop, RITL, fixed-radio
   access, FRA) Connecting subscribers to the public switched
   telephone network (PSTN) using radio signals instead of
   copper wires.  The wireless link may be all or part of the
   connection between the subscriber and the switch.  WLL
   includes cordless access systems, proprietary fixed radio
   access and fixed cellular systems.

   (2008-03-15)