A diplomatic cable, also known as a diplomatic telegram or embassy cable, is the term given to a confidential text message exchanged between a diplomatic mission, like an embassy or a consulate, and the foreign ministry of its parent country.
^Definition of "cable", The Macquarie Dictionary (3rd ed.). Australia: Macquarie Library. 1997. ISBN0-949757-89-6. "(n.) 4. a telegram sent abroad, especially by submarine cable. (v.) 9. to send a message by submarine cable."