Social Security Number
Social Security Number (SSN) means the nine-digit number that is assigned to a person by the Social Security Administration and that identifies the record of the person's earnings reported to the Social Security Administration. The term does not include a number with a letter as a suffix that is used to identify an auxiliary beneficiary.
24 CFR § 5.214
In addition to the definitions in 5.100, the following definitions apply to this subpart B: