What phonetic alphabet term corresponds to the letter X?

The term that corresponds to the letter X in the phonetic alphabet is "X-Ray." The phonetic alphabet, often used in military and aviation communications, assigns specific words to each letter of the alphabet to ensure clarity and avoid misunderstandings over radio or telephone transmissions. "X-Ray" not only starts with the letter X, but it is also widely recognized and used in various communication contexts.

The other terms listed, such as "Xenon," "Xylophone," and "Exclamation," do not hold standardized recognition in the phonetic alphabet. They might begin with X, but they do not serve the purpose of enhancing communication clarity like "X-Ray." Therefore, "X-Ray" is the correct term to represent the letter X in this specific phonetic context.