Which word is used in the phonetic alphabet for the letter 'X'?

The phonetic alphabet, also known as the NATO phonetic alphabet or the International Radiotelephony Spelling Alphabet, is designed to ensure clarity in communication, especially in noisy environments or when conveying important information such as letters in call signs or codes.

The correct word for the letter 'X' in this alphabet is "X-ray." This term was chosen due to its widespread recognition and ease of understanding, especially in international contexts. The use of "X-ray" effectively avoids confusion that might arise from similar-sounding letters or words.

Other choices like "Xerox," "Xenon," and "Xtreme," while all starting with the letter 'X,' are not part of the standard phonetic alphabet. Each of these alternatives may not be immediately recognized or understood universally, which is crucial in situations where clear and effective communication is paramount. Thus, "X-ray" remains the preferred and officially established term to convey the letter 'X.'