SNIA Online Dictionary

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QLC	[Hardware] Acronym for Quad-Level Cell
QoS	[Management] Acronym for Quality of Service.
Quad-Level Cell	[Hardware] A memory cell that stores four bits of data.
Quality of Service	[Management] A technique for managing computer system resources by specifying user visible parameters. Policy rules are used to describe the operation of network elements to make QoS guarantees. Message delivery time is an example of a user visible parameter that manages the rate of a data transfer. Relevant IETF standards for QoS are RSVP (Resource Reservation Protocol) and COPS (Common Open Policy Service).
quiesce	[Computer System] To bring a system or component to a quiescent state.
quiescent state	[Computer System] A state in which all activity has been suspended.
quota	[File System] A limit that restricts the amount of a resource that a user, group or directory structure may consume. An example of a resource that may have an associated quota is storage capacity.