The Collaborative International Dictionary
Striking plate
Striking \Strik"ing\, a. & n. from Strike, v. Striking distance, the distance through which an object can be reached by striking; the distance at which a force is effective when directed to a particular object. Striking plate.
The plate against which the latch of a door lock strikes as the door is closed.
A part of the centering of an arch, which is driven back to loosen the centering in striking it.
Wiktionary
striking plate
n. 1 The plate against which the latch of a door lock strikes as the door is closed. 2 Part of the centering of an arch, which is driven back to loosen the centering in striking it.