Clue: W-4 datum: Abbr.

Answer: SSN

Length: 3

---

Similar Clues:

• Modern weapon: Abbr. (e.g. AAM with 3 letters)
• Writers' changes: Abbr. (AAS with 3 letters)
• Sports league that used a red-white-and-blue ball: Abbr. (ABA with 3 letters)
• Defunct sports league that used a red, white and blue ball: Abbr. (ABA with 3 letters)
• "Star Wars" weapon: Abbr. (ABM with 3 letters)
• "Star Wars" weapon (abbr.) (ABM with 3 letters)
• West Point, e.g.: Abbr. (ACAD with 4 letters)
• West Point, etc.: Abbr. (ACADS with 5 letters)
• Window units: Abbr. (ACS with 3 letters)
• Some windows installations: Abbr. (ACS with 3 letters)