73 in Morse Code
73 is written as --... ...-- in International Morse Code. A traditional Morse code sign-off meaning "Best Regards". Extremely common among amateur radio (Ham radio) operators as a friendly way to end a conversation.
The number 73 has been used since the early days of telegraphy. In the "92 Code" adopted in 1859, 73 was defined as "Accept my compliments" or "Best Regards". Extremely common among amateur radio (Ham radio) operators as a friendly way to end a conversation.