Which word is used for the letter 'X' in the Phonetic Alphabet?

The correct term used for the letter 'X' in the Phonetic Alphabet is "X-Ray." This standardized phonetic code is essential for clear communication, especially in military environments where miscommunication can have serious consequences. The use of "X-Ray" helps to avoid confusion with similar-sounding letters and ensures that the intended letter is clearly understood over radio transmissions or noisy environments.

The other options do not serve the purpose of the phonetic alphabet. "Xenon" is a chemical element and does not convey clarity for communication purposes. "Xpert," while a play on the word "expert," is not a term recognized in the phonetic alphabet. "Examine" also does not have any association with the phonetic representation of the letter 'X.' Thus, "X-Ray" stands out as the designated and widely accepted vocabulary for representing that particular letter in communication systems.