The Clue
It's just past three (2 letter answer)
The Answer
PI
Tags
Notes
The answer PI is so rare that it appears less than once every 2500 puzzles.
Related Clues
Common ratio
Definition
PI as a noun:
1. the ratio of the circumference to the diameter of a circle; approximately equal to 3.14159265358979323846...
2. (private detective, PI, private eye, private investigator, operative, shamus, sherlock) = someone who can be employed as a detective to collect information
3. (principal investigator, PI) = the scientist in charge of an experiment or research project
4. the 16th letter of the Greek alphabet
5. (protease inhibitor, PI) = an antiviral drug used against HIV; interrupts HIV replication by binding and blocking HIV protease; often used in combination with other drugs