Morse Code

A 

code

 in which each letter is represented by 

a

 pattern of 

dot

 and/or dashes, developed by Samuel Morse 

in

 the 1800s.The signals are sent by sound, light beams, 

or

 electric pulses.

A

 dot is 

a

 signal of short duration, 

and

 a dash is 

a

 signal of longer duration.Morse 

code

 was used to send telegraph messages before the invention of the telephone 

and

 has been used 

in

 many other ways, such 

a

 emergency 

and

 wartime communications.