Boat anchor
From CSSEMediaWiki
A Boat Anchor is a piece of software or hardware that serves no useful purpose on the current project. Often, the Boat Anchor is a costly acquisition, which makes the purchase even more ironic.
The reasons for acquiring a Boat Anchor are usually compelling at the time. For example, a policy or programmatic relationship may require the purchase and usage of a particular piece of hardware or software. This is a starting assumption (or constraint) of the software project. Another compelling reason is when a key manager is convinced of the utility of the acquisition.