Acronyms, initialisms, abbreviations, contractions, and other phrases which expand to something larger, that I’ve seen in this thread:

Fewer Letters	More Letters
DNS	Domain Name Service/System
LVM	(Linux) Logical Volume Manager for filesystem mapping
NAS	Network-Attached Storage
SSD	Solid State Drive mass storage
SSH	Secure Shell for remote terminal access
VPN	Virtual Private Network
ZFS	Solaris/Linux filesystem focusing on data integrity
nginx	Popular HTTP server

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