Washington Post Crossword  

September 21, 2025

Evan Birnholz  

 

What do the following two-letter words have in common?

 

1. Id

2. It

3. Or

4. Do

5. Pi

 

Answer:

 

When both letters are capitalized, they are common abbreviations:

 

1. ID (or I.D.) (identity/identification)

2. I.T. (information technology)

3. O.R. (operating room)  

4. D.O. (doctor of osteopathy)

5. P.I. (private investigator)