Morse code
US /ˈmɔːrs koʊd/
UK /ˈmɔːrs koʊd/

1.
mã Morse
a telegraphic code in which letters and numbers are represented by strings of dots and dashes (short and long signals)
:
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The message was sent using Morse code.
Tin nhắn được gửi bằng mã Morse.
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Learning Morse code takes practice.
Học mã Morse cần luyện tập.