- - XXX-XX-XXXX nos
- - Nine-digit ID nos
- - figs. in the format xxx-xx-xxxx
- - Tax return nos.
- - Three-part nos.
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- - (xxx)xxx-xxxx no.
- - Arabic hill; phone no.
- - no. on a card
- - contacts list no.
- - No. to call
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- - Identifier in the form xxx-xx-xxxx (Abbr.)
- - Personal digits you might keep secret in the U.S.
- - 9-digit item [abbr.]
- - String of digits assigned at birth or upon becoming a U.S. citizen (Abbr.)
- - nine-digit item: abbr.
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- - XXXXIII times XIV
- - 602, in Roman numerals
- - Roman 602
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- - Org. that uses the pattern XXX-XX-XXXX
- - Org. that determines Medicare eligibility
- - Disability benefits org.
- - Org. created under F.D.R.
- - US agency that manages public retirement benefits
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- - XXXXX, to the Greeks
- - greek letters that look like xs
- - X's, to Athena
- - Greek X's
- - Greek Xs
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- [ Other definitions ]