The term 'kind of cycle' can refer to a variety of different cycles. The crossword solutions for this term are UNI (3 letters), LUNAR (5 letters), SLEEP (5 letters), SOLAR (5 letters), TRI (3 letters), and MEGA (4 letters). A unicycle is a single-wheeled vehicle that requires balance and skill to ride. A lunar cycle is the period of time it takes for the moon to complete its orbit around the Earth, which is approximately 29.5 days. A sleep cycle is the natural pattern of alternating between periods of sleep and wakefulness over a 24-hour period. A SOLAR cycle is the period of time it takes for the sun to complete its orbit around the center of the Milky Way galaxy, which is approximately 225 million years. A tricycle is a three-wheeled vehicle that is often used by children. Finally, a mega cycle is a unit of measurement equal to one million cycles per second.