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The "-P Convention" or "P Question" refers to the act of making a statement into a question by appending "P." When spoken aloud, the "P" is literally pronounced as a separate syllable "Pee."
This practice originated among users of the Lisp programming language, in which there is the convention of appending the letter "P" on elements to denote a predicate (a yes or no question). It is most commonly used at MIT and the University of California, Berkeley, or among computer scientists working in Artificial intelligence (which frequently uses Lisp).
The typical example of use is:
Q: "Foodp?" (Do you want food?) A: "T!" (Literally, True: yes) A: "Nil." (Also Null; no, I don't want food).