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

QAM
       Quadrature Amplitude Modulation (HiperLAN/2, 802.11a)


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

QAM

   1. Quadrature Amplitude Modulation.

   2. Quality Assurance Management.