Glossary Glossary # A B C D E F G H I J K L M N O P Q R S T U V W X Y Z There are currently 2 glossary items in this directory beginning with the letter V.Voluntary-closing devicesA type of terminal device that when relaxed is in the open position and is closed on an object by a conscious effort by pulling on the control cable.Voluntary-opening devicesA type of terminal device that is opened by a conscious effort by pulling on the control cable with body motion and closed by elastic bands.