The term 'water glider' is a type of watercraft that combines the features of a sailboat and a kayak. It is also known as a 'SKI, ' which is a three-letter word that can be used to solve a crossword puzzle. Water gliders are designed to be lightweight and easy to maneuver, making them ideal for recreational activities such as fishing, sailing, and exploring. They are also popular among competitive sailors due to their speed and agility.