P vs t

P

character

  • The sixteenth letter of the English alphabet, called pee and written in the Latin script. 

noun

  • A P wave on an electrocardiogram. 

name

  • The set of all problems that are solvable in polynomial time by a deterministic Turing machine 

t

character

  • The twentieth letter of the English alphabet, called tee and written in the Latin script. 

How often have the words P and t occurred in a corpus of books? (source: Google Ngram Viewer )