HSM

A hardware security module (HSM) is a physical computing device that safeguards and manages digital keys for strong authentication and provides cryptoprocessing. 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.

Gemalto HSM

https://safenet.gemalto.com/data-encryption/hardware-security-modules-hsms/

A hardware security module (HSM) is a dedicated crypto processor that is specifically designed for the protection of the crypto key lifecycle. Hardware security modules act as trust anchors that protect the cryptographic infrastructure of some of the most security-conscious organizations in the world by securely managing, processing, and storing cryptographic keys inside a hardened, tamper-resistant device.

nShield

https://www.thalesesecurity.com/products/general-purpose-hsms

nShield hardware security modules (HSMs) provide a hardened, tamper-resistant environment for secure cryptographic processing, key generation and protection, encryption and more. Available in three FIPS 140-2 certified form factors, nShield HSMs support a variety of deployment scenarios.

The YubiHSM 2 offers superior protection for private keys against theft and misuse.