Clue: Invoice ID: Abbr.

Answer: SSN

Length: 3

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Similar Clues:

• Invoice abbr. (e.g. ACCT with 4 letters)
• Invoice abbreviation (e.g. AMT with 3 letters)
• Invoice total: Abbr. (AMT with 3 letters)
• Secret identity?: Abbr. (ANON with 4 letters)
• Abbr. on an invoice (ATTN with 4 letters)
• Class with idioms: Abbr. (ESL with 3 letters)
• "You get the idea": Abbr. (ETC with 3 letters)
• "... you get the idea": Abbr. (ETC with 3 letters)
• "The Bourne Identity" setting: Abbr. (EUR with 3 letters)
• Location identifier: Abbr. (GPS with 3 letters)