The term AIDE TO SANTA is represented by the crossword solution ELF, which is a three letter word. An ELF is a mythical creature in European folklore that is often associated with Santa Claus and his workshop at the North Pole. Elves are usually depicted as small, mischievous helpers who assist Santa in making toys and delivering presents to children on Christmas Eve. Elves are also known for their magical abilities, such as being able to fly and make themselves invisible.