It stands for "alcohol clinical training" when including alcohol, although that is not the most common usage of the acronym. More commonly it would stand for "american college testing".
Is it dangerous if someone else knows my social security number?
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Probably not.
While many current Quora users may be too young to remember this, many job applications used to ask the person applying for their date of birth and Social Security Number. And almost all applicants put them on a form which was likely filed away or simply thrown away in the trash some time later.
There's also the fact that medical professionals, insurers, various government agencies, all financial institution which you do business with, many ex-friends and lovers, family members, most educational institutions and grantors of credit all had or have access to your SSN.
