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From Memory Alpha on the Menagerie:
Now, confined to a wheelchair, Pike is disfigured and cannot speak, though his mind is unimpaired. His sole means of communication is a flashing light with an accompanying beep: once for yes, twice for no.
You know, given that this was made in 1966, and that Gene Roddenberry had served extensively in the military, I would bet good money that someone involved in production had heard of Morse code.
(The episode description gives no hint of his communicating anything other than Yes or No.)
Now, confined to a wheelchair, Pike is disfigured and cannot speak, though his mind is unimpaired. His sole means of communication is a flashing light with an accompanying beep: once for yes, twice for no.
You know, given that this was made in 1966, and that Gene Roddenberry had served extensively in the military, I would bet good money that someone involved in production had heard of Morse code.
(The episode description gives no hint of his communicating anything other than Yes or No.)