The term TYPE OF GEAR can be solved by two three-letter crossword solutions: CAM and LOW. A CAM is a rotating or sliding piece in a mechanical linkage used to transform rotary motion into linear motion, or vice versa. It is often used to convert circular motion into reciprocating motion. A LOW gear is a gear ratio that provides the greatest torque multiplication and the lowest speed reduction. LOW gears are used for climbing steep hills and for providing greater control when descending.