reglet
/ˈrɛɡlɪt
/noun
1 Printing A thin strip of wood or metal used to separate type.A reglet plane (not to be confused with a raglet) was used to make the strips of wood (reglets) used to space type in hand typesetting.
2 Architecture A narrow strip used to separate mouldings or panels from one another.
Origin
Mid 17th century: from French réglet, diminutive of règle 'rule'.