A nail with a collar designed to prevent it from being driven flush, making it easy to remove, used for temporary structures.

(telecommunications) semiduplex

(ecclesiastical law) A complaint in the nature of an appeal from the ordinary to his immediate superior, as from a bishop to an archbishop.

plural of duplex nail

(telecommunications) Synonym of semiduplex

(telecommunications) Describing a duplex system in which both parties can communicate with each other simultaneously