Sentence:  Into the middle arch of each desk silver-headed <WSD>brads</WSD> had been hammered to form a lion, a bear, a ram, a dove, and in the midst a flaming torch. 
Meaning of the word marked with <WSD> tags:  A thin, small nail, with a slight projection at the top on one side instead of a head, or occasionally with a small domed head, similar to that of an escutcheon pin.