The modern system consists of symbols for twenty six letters, as well as symbols for indicating numbers, cancels, errors, and the rest position. Robert Hooke proposed the first system for it in 1684, 
The modern system consists of symbols for twenty six letters, as well as symbols for indicating numbers, cancels, errors, and the rest position. Robert Hooke proposed the first system for it in 1684, but it was the French who popularized it over a hundred years later by creating a system that could transfer over 30 symbols from Lille to Paris in only 32 minutes. FTP, identify this system of visual communication that preceded the telegraph and relied on flags for conveying messages.
The modern system consists of symbols for twenty six letters, as well as symbols for indicating numbers, cancels, errors, and the rest position.
Semaphore