specialkey
nounUK /ˈspɛʃəl kiː/
US /ˈspɛʃəl kiː/
A special key is a key that does something extra or different from the other keys.
Press the special key on the keyboard to open the secret menu.
OTHER MEANINGS
2. A key that is made just for one person or one purpose.
The janitor carries a special key that opens every door in the school.
3. A secret code word used to unlock something.
Only members know the special key to enter the clubhouse.
4. A key on a keyboard that has a unique job, like the Shift or Control key.
Hold down the special key while you type to make capital letters.