Morse code

Từ điển Việt Anh Việt 4in1 - English Vietnamese 4 in 1 Dictionary

Morse code /ˌmɔːs ˈkəʊd $ ˌmɔːrs ˈkoʊd/ BrE AmE noun [uncountable]
a system of sending messages in which the alphabet is represented by signals made of ↑dots (=short signals) and ↑dashes (=long signals) in sound or light
in Morse code
a message in Morse code