Washlet is a trademark of Japanese toilet company Toto, Ltd., referring to a heated toilet seat with multiple functions that facilitate washing and drying.
It is sometimes used to refer to all electric bidet seats, similar to the way Kleenex is commonly used to refer to facial tissue.
The first Washlet hit the market in 1980 after two years of research and development. Over 300 Toto employees participated in studies to determine the optimal wash temperatures for the bidet spray, and more studies were conducted to determine the optimal angle of the spray.
Production hit 100,000 units the year following its release. Since 1980, over 30 million Washlet bidet seats have been sold.