Reglet

noun

1. A strip of wood or metal of the height of a quadrat, used for regulating the space between pages in a chase, and also for spacing out title pages and other open matter.
2. A flat, narrow moulding, used chiefly to separate the parts or members of compartments or panels from one another, or doubled, turned, and interlaced so as to form knots, frets, or other ornaments.