UEFI
Proper noun
Meaning
UEFI
(computing) Initialism of Unified Extensible Firmware Interface: a specification that defines a software interface between an operating system and platform firmware.
Examples
According to Microsoft, the KB4524244 security patch was designed to 'address an issue in which a third-party Unified Extensible Firmware Interface (UEFI) boot manager might expose UEFI-enabled computers to a security vulnerability.'
According to these slides on replacing UEFI with Linux: Between Linux and the hardware are at least 2 ½ kernels.
ESET is the first internet security provider to add a dedicated layer into its solution that protects the Unified Extensible Firmware Interface (UEFI).
Given that all current OS's are UEFI aware I can see the 'Legacy'
Instead, the key is stored in the computer’s UEFI firmware or BIOS by the manufacturer.
Intel(R) Management Engine Interface (v11.7.0.1040) is required for UEFI update, and improves recovery from Connected Standby.