Boat anchor
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In computing, a boat anchor is a piece of useless computer hardware - so-called because theoretically their only productive use is to be thrown into the water as a boat mooring (a common use for large obsolete or non-functional pieces of machinery). Early computers, where the term originated, were physically large and heavy devices, making them eminently suitable for such a use.
The original meaning was simply that the computer gear in question was obsolete, and no longer useful.
A later meaning is a piece of hardware or software that serves no useful purpose that is kept around for political reasons. Often, everyone is secretly waiting for it to be used again, so it is no longer a derelict eyesore. In this meaning, a boat anchor is considered an example of an anti-pattern.