ID theft data, perhaps

• Box "d" on IRS Form W-2
• Nine-digit fig. on an IRS tax form
• IRS requirement
• ID-theft target
• Figure kept in the head, usually: Abbr
• Job application fig.
• ID info., in the U.S
• W-2 digits: Abbr
• Sensitive ID

Wikipedia Word definitions in Wikipedia
SSN may refer to: