signal board

noun

a board for displaying electrically transmitted signals and indicating their source.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for signal board

I glanced to the signal-board; our score was ninety-six, only twenty-seven to win!
Parkhurst Boys
Talbot Baines Reed
Redgrave put out his hand to the signal-board and rang for full power.
A Honeymoon in Space
George Griffith
Loud cheers announced the posting of thirty on the signal-board, but still the score went on.
The Fifth Form at Saint Dominic's
Talbot Baines Reed
The Westfield fellows look nervously at the signal-board, as if by watching it they could make our figure grow less.
Parkhurst Boys
Talbot Baines Reed