joke | See trick. | |
joystick | A pointing device popular in computer games. Named after a similarly shaped control in many airplanes. | |
JPG | Joint Photographic Experts Group. The original name of the committee that designed the standard image compression format. JPEG is designed for compressing either full-color or gray-scale digital images of "natural", real-world scenes. | |
jumper | An electrically-conductive part that is used to connect two or more points on a circuit board. Commonly used to select among options or turn an option on or off. |