abriviations

Computer hardware
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ELF    - Executable and Linkable Format https://ru.wikipedia.org/wiki/Executable_and_Linkable_Format
EFI    - Extensible Firmware Iterface
PMU    - Performance Monitor Unit
PML    - Page Modification Logging
PKRU   - pkeys -- memory protection keys Memory Protection Keys provide a mechanism for changing
         protections without requiring modification of the page tables on
         every permission change http://man7.org/linux/man-pages/man7/pkeys.7.html
SMM    - System Management Mode https://www.google.ru/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=SMM+intel
MCE    - Machine Check Exception
PAE    - Phisical Address Extension
NX     - (bit) no execute bit (related to PAE)
TSS    - Task State Segment
ACPI   - Advanced Configuration and Power Interface
FADT   - fixed ACPI description table
VMX    - Virtual Machine eXtension
NAS    - Network-Attached Storage
SR_IOV - Single-root Input Output Virtualization
VFIO   - Virtual Vunction Input Output
IBPB   - Indirect Branch Prediction Barrier (Spectre)
OVMF   - Open Virtual Machine Firmware
UEFI   - Unified Extensible Firmware Interface

interrupts
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IRQ  - an interrupt
NMI  - non-maskable interrupt (arising anyway, even if interrupt are tured off on cpu)
SMI  - system management interrupt, chipset send SMI to CPU to switch CPU to System Management Mode (SMM)
SCI  - system control interrupt, an interrupt fired by ACPI
GSI  - global system interrupt - IRQ0 (still not sure that it's true, concluded from here http://wiki.osdev.org/IOAPIC)

MCE  - Machine Check Exception
PMI  - Performance Monitoring Interrupt

IT
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SAN  - Storage Area Network
LUN  - Logical Unit Number
S3   - Amazon Simple Storage Service
S.M.A.R.T - HDD Self-Monitoring, Analysis and Reporting Technology

Business
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EMEA - Europe, the Middle East and Africa