Which term refers to a trademark that has been discontinued and is no longer in use?

The term that refers to a trademark that has been discontinued and is no longer in use is known as a dead mark. A dead mark signifies that the trademark is not actively being used in commerce and may have been abandoned by the owner for various reasons, including failure to renew the registration, or a voluntary abandonment due to lack of use. This status is crucial as it indicates that the trademark is no longer protecting a brand or product and may be available for others to adopt or use.

In the context of trademark law, live marks denote trademarks that are currently in use and still maintain their registration status. Registered marks refer to trademarks that have been successfully registered with the USPTO, while abandoned marks could imply a broader context of trademarks that haven't been sufficiently maintained but aren't necessarily defined as "dead." However, the specific term "dead mark" directly relates to the status of a trademark that is fully inactive and unclaimed.