cipherpen
nounUK /ˈsaɪfəpɛn/
US /ˈsaɪfərpɛn/
A cipherpen is a special pen that writes in secret code so only your friends can read it.
Mia used her cipherpen to write a hidden message to her best friend.
OTHER MEANINGS
2. A pen used to write encrypted text for puzzles or games.
The detective solved the case by reading the note written with a cipherpen.
3. A playful tool that turns ordinary letters into symbols.
At the school fair, kids used a cipherpen to make their names look like ancient runes.
4. A pen whose ink only becomes visible under special light.
He hid his diary entries with a cipherpen that only showed up under a UV lamp.