X factor meaning

What does the saying 'X factor' mean?

Idiom: X factor

Meaning:

The dangers for people in the military that civilians do not face, for which they receive payment, are known as the X factor.
Country: International English | Subject Area: General | Usage Type: Both or All Words Used
All idioms have been editorially reviewed, and submitted idioms may have been edited for correctness and completeness.
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