Y-splitter also called a Y-cable, is a type of cable adapter that is arranged in a Y-shaped formation and is used to connect one device to a pair of other devices.

Y-connector is a type of adapter that can be used to connect a single device or cable to two devices or cables.

Y2K, also called the year 2000 problem or the millennium bug (even though it is not actually a bug), is a computer problem that was expected to affect older hardware and software on January 1, 2000.