A device consisting of an array of jacks mounted on a panel, used (especially in the recording, broadcasting, etc., of audio and video) for routing signals from several other devices.

1Attributive Designating a type of black-glazed earthenware manufactured in the Shropshire village of Jackfield in the 18th century, having decorative oil-gilding and sometimes also Jacobite inscriptions. Later also: designating any of various similar types of earthenware; especially designating that manufactured in Staffordshire, having a black-glazed body of red clay which is either painted or oil-gilded to resemble lacquer or decorated with (especially white) trailing vines in relief. Frequently in "Jackfield ware".

2Jackfield earthenware.