English

Noun

letterboard ‎(plural letterboards)

1. A signboard for lettering or text.
   • 1941, Transit Journal: Volume 85

     So 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, Awakenings

     One 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.'