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

Fewer Letters	More Letters
ESXi	VMWare virtual machine hypervisor
LXC	Linux Containers
NAS	Network-Attached Storage
SSH	Secure Shell for remote terminal access
VPN	Virtual Private Network
ZFS	Solaris/Linux filesystem focusing on data integrity

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