The Rice University Neologisms Database

Usually expressed in the written form (through texts or on internet forums), qt 3.14 is a play on the term of endearment "cutie pie." The letters "qt" are a phonetic representation of the word "cutie," while 3.14 is a mathematical pun on pie/pi (the transcendental number pi's first three digits are 3.14). When spoken aloud, every element of the word may be sounded out or the term may be pronounced as intended, i.e. as "cutie pie."