Is It an X or a X?

It’s an X. Since the pronunciation of the individual letter "X" begins with a vowel sound, we use the indefinite article "an".

It’s an X. Since the pronunciation of the individual letter "X" begins with a vowel sound, we use the indefinite article "an".

You can use an X to label a specific location.

You can use a X to label a specific location.

Be aware that the rule for using a or an is based on pronunciation, not spelling.

At the end of text messages, an X means both a kiss and the love behind it.

An x-plane was used to test a new aerodynamic technology.

Follow the same strategy with other consonants that are pronounced with a vowel sound, and therefore take the article "an"; for example, we say:

We also use the indefinite article "an" before a range of abbreviations that begin with the letter "X" but have an initial vowel sound, so we say "an X-ray", "an XL" (eXtra Large), or "an XML" (eXtensible Markup Language).

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