A hardware security module (HSM) is a physical computing device that safeguards and manages secrets (most importantly digital keys), performs encryption and decryption functions for digital signatures, strong authentication and other cryptographic functions. These modules traditionally come in the form of a plug-in card or an external device that attaches directly to a computer or network server. A hardware security module contains one or more secure cryptoprocessor chips.

https://en.wikipedia.org/wiki/Hardware_security_module

Hardware Security Module.

A tamper resistant piece of hardware that does key management as well as encryption services. Essentially once a key is installed (or generated) it never sees the light of day again.

Looked it up, appears to be Hardware Security Module.

Hardware Security Module

Hardware Security Module (HSM).