tonefork
nounUK /ˈtəʊnfɔːk/
US /ˈtoʊnfɔːrk/
A tonefork is a small metal tool that makes a steady musical sound when you hit it.
The music teacher tapped the tonefork and everyone sang the note.
OTHER MEANINGS
2. A fork-shaped device used to set or check the pitch of an instrument.
He used a tonefork to tune his guitar before the show.
3. A small electronic gadget that plays a reference note for singers.
The choir director carried a digital tonefork in her pocket.
4. A two-pronged metal tool that vibrates at a fixed frequency when struck.
Striking the tonefork against her knee, she hummed the starting note.