Close to the bridge of a violin?

The bridge is the structure that rests on the main body of the instrument and holds the strings up; it is crescent-shaped at the top (traditional fiddlers might make theirs flatter?) and stands on two legs. Playing the bow close to the bridge gets a thinner, scratchier sound (mostly treble, little bass, as it were). The Italian term for this is "sul ponticello". Hope this helps!