Clue: Nine-digit-number issuing org.

Answer: SSA

Length: 3

---

Similar Clues:

• Nine-digit number, maybe (ZIP with 3 letters)
• Highest one-digit number (NINE with 4 letters)
• Five-digit postal number, informally (ZIP with 3 letters)
• Org. issuing nine-digit IDs (SSA with 3 letters)
• Organ numbers (HYMNS with 5 letters)
• Five-digit number on an envelope (ZIP with 3 letters)
• Three-digit number (AREACODE with 8 letters)
• Obvious trait of a certain two-digit number? (TWENTYFOURSEVEN with 15 letters)
• Digital number? (TEN with 3 letters)
• 101-digit number (GOOGOL with 6 letters)