Related Clues:

• One can't start with 666: Abbr
• Bank account ID
• Identity thief's target, briefly
• Tax return fig
• ID on a tax return
• 'Last four digits' ID
• No. on tax forms
• Double-dash designation
• ID on many returns
• Twice-hyphenated ID
• Fig. often written with X's
• Digits on a paper card, for short
• Certain acct. info
• ID in the form xxx-xx-xxxx
• ID on a mortgage application