What is another word for telegraph key?
Pronunciation: [tˈɛlɪɡɹˌaf kˈiː] (IPA) 
The telegraph key, or Morse key, has been an essential tool for communication since the 19th century. It is a device that transmits electric signals by opening and closing a circuit with a metallic lever. Synonyms for telegraph key include Morse key, telegraph switch, telegraph transmitter, and telegraph instrument. Other variations of the telegraph key include the straight key, coherer, spark gap transmitter, and wireless telegraph key. These devices were used extensively in the military, maritime, and railroad industries, and also helped to revolutionize global communication. While modern technology has made the telegraph key obsolete, its influence on communication technology cannot be underestimated.
