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general view 
doorknob 
Knob in the form of a lever used only for latch bolt locks.
rose 
Decorative plaque with an opening in the center allowing the doorknob to turn.
latch bolt 
Part whose beveled end is activated by a doorknob; it catches automatically in a strike plate when the door is closed.
faceplate 
Thin plate fastened to the edge of the door with an opening through which the bolt passes.
escutcheon 
Thin plate fastened to the door with openings for the lock’s rose and ring.
dead bolt 
Part whose end is inserted into a strike plate to lock the door when activated by a key.
lock 
Device mounted on the door allowing it to lock by using a key.