Is it grammatically correct to say ‘An X mark’ or ‘A X mark’ ?

An X mark or A X mark?

“An X”
The choice between “a” and “an” is determined by the sound of the following syllable: “a” for consonant, “an” for vowel. Since “X” is pronounced “ex”, it’s “an ex”.

An X mark

Source(s): Wikipedia

Just as you have already written – an ‘X’ mark

An x-mark. (with a hyphen in it).

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