securitykey
nounUK /sɪˈkjʊərəti kiː/
US /sɪˈkjʊrəti kiː/
A special key that keeps something safe and stops other people from getting in.
Dad used the security key to lock the front door.
OTHER MEANINGS
2. A small device you plug in to prove who you are when using a computer.
She plugged the security key into the laptop to sign in.
3. A secret code that protects a message or account.
The app sent a security key to his phone.
4. A key that opens a locked gate or box in a safe way.
The guard carried a security key for the back gate.