Letterboard

Origin

letter + board

Full definition of letterboard

Noun

1. A signboard for lettering or text.
• 1941, Transit Journal: Volume 85So reads the new slogan painted on the letterboards of New York City omnibuses.
2. A board marked with letters of the alphabet, used for communication by the disabled.
• Oliver Sacks, AwakeningsOne of the patients, Leonard L., when he heard of L-DOPA, rapped on his letterboard with mixed enthusiasm and irony, 'Dopamine is Resurrectamine. Cotzias is the Chemical Messiah.'