"Pear" is a fruit which never found singly because the word "A Pear" is pronounced as the word "Pair". So, it's the word of fruit that is never found singly.,Pear is a fruit which never found singly. Single = No Pair ( Only saying about this riddle) A pear = Pair ( Only saying about this riddle) So , Pear is a pair hence it is not found single. It is always found in pair .