The telegram typed three numbers.

The three numbers typed in a telegram usually refer to the code. Code is a very simple way of communication. By sending different combinations of signals with different lengths, the information that needs to be conveyed can be conveyed. Morse code is a code used to generate electricity and tell time, which consists of dots (-) and dashes (-). Specifically, points represent one time unit, strokes represent three time units, points and strokes are separated by one time unit, words by three time units and words by seven time units. In this way, only three numbers can be used to represent any character or number, which is convenient for both the sender and the receiver.