The term 'OWL'S QUESTION?' is a reference to the sound an owl makes, which is often written as 'who' or 'whoo'. The crossword solutions for this term are WHO (3 letters) and WHOO (4 letters). The sound of an owl is usually represented by these two words, with WHO being the shorter version and WHOO being the longer one. This sound is often associated with mystery and wisdom, as owls are often seen as wise creatures in many cultures.