Q
QA - quality assurance (In the area of operational security administrative management, an approach to ensuring that activities meet the prescribed standards in relation to supporting documentation and nomenclature.)
QC - quality control (A method/process which ensures that an organization's activities, services, equipment, and personnel operate within accepted or intended standards.)
QL - query language (A computer language which allows users to query/make requests of a database.)
QMS - quality management system (A collection of processes and activities intended to ensure desired levels of quality are met, incorporating quality assurance and quality control practices.)
QoS - Quality of Service (A capability that allows a protocol to distinguish between different classes of messages and assign priority levels - allows an administrator to assign a priority to time-sensitive traffic. Allows a service provider to guarantee a level of service to its customers.)
QR code - Quick Response code (A type of two-dimensional bar code used to label products and track sales, as well as for identification.)
QSA - Qualified Security Assessor (Individual deemed qualified to conduct a compliance audit and issue a report on organizations handling payment card transactions, in accordance with the Payment Card Industry Data Security Standard (PCI DSS).)