SSH
networkingSecure Shell — a cryptographic network protocol for operating network services securely over an unsecured network, most commonly used for remote login.
Pronunciation
Correct
S-S-H
/ɛsɛseɪtʃ/
Always spelled out as individual letters: S-S-H. Stands for Secure Shell. The RFC and OpenSSH project consistently use this spelling.
Source: www.rfc-editor.org(official spec)