−−−−·
// MORSE · DIGIT
The digit 9 in Morse
the digit 9 is coded −−−−· — five symbols. One of the regular digits in the system, identical between continental and international Morse.
Memory hook
Four dashes, one dot — mirror of 1.
CW phonetic: say "daa daa daa daa di" out loud. "di" is short, "daa" is three times longer.