In the North Atlantic Treaty Organization (NATO) phonetic alphabet what does the letter Z stand for?

The International Radiotelephony Spelling Alphabet, commonly known as the North Atlantic Treaty Organization (NATO) phonetic alphabet, NATO spelling alphabet, ICAO phonetic alphabet or ICAO spelling alphabet, is the most widely used radiotelephone spelling alphabet. The letter Z represents the word Zulu.

Spelling alphabets are often inaccurately called "phonetic alphabets", but they do not indicate phonetics and cannot function as phonetic transcription systems like the International Phonetic Alphabet.

A series of international agencies including NATO assigned a 26 code words acrophonically to the letters of the English alphabet, so that the names for letters and numbers would be distinct enough to be easily understood by those who exchanged voice messages by radio or telephone, regardless of language differences or the quality of the connection.