Social Security number
In its brief before the Court, the government's brief informed the Social Security Administration "...itself assigns [Social Security numbers] to persons who are required by federal law to have one but decline to complete an application. If, for religious reasons, the individual requiring [a Social Security number] does not wish to receive a social security card, the agency will accommodate that request. Similarly, when an applicant refuses to sign an application for [a Social Security number] on religious grounds, [Social Security Administration personnel] may sign in lieu of the applicant."