Multiple choice general knowledge science & technology There are _____ number of human body parts that are 3 letter long. 7 9 10 12 Reveal answer Fill a bubble to check yourself C Correct answer Explanation This is a trivia/word puzzle. Commonly cited 3-letter body parts include: eye, ear, leg, arm, toe, jaw, hip, and rib, totaling 10. However, some sources count only 7-8, so this is somewhat subjective.