What does X stand for?

X stands for "Adults only, no one under 17 admitted"

How to abbreviate "Adults only, no one under 17 admitted"?

"Adults only, no one under 17 admitted" can be abbreviated as X

What is the meaning of X abbreviation?

The meaning of X abbreviation is "Adults only, no one under 17 admitted"

What does X mean?

X as abbreviation means "Adults only, no one under 17 admitted"