tapcode
nounUK /ˈtæp.kəʊd/
US /ˈtæp.koʊd/
A secret way of sending messages by tapping sounds.
The prisoners used tapcode to talk to each other through the wall.
RELATED WORDS
OTHER MEANINGS
2. A system that uses patterns of taps to stand for letters.
He learned the tapcode alphabet in just one afternoon.
3. Any coded message made by tapping on a surface.
She sent a quick tapcode on the door to let us know she was there.
4. A way to communicate secretly without speaking.
The scouts practiced tapcode so they could share clues quietly.