As with the previous technique, an overflow area is maintained for collisions that
cannot be placed at the hash address. However, with this technique each bucket
has an additional field, sometimes called a synonym pointer, that indicates
whether a collision has occurred and, if so, points to the overflow page used. If the
pointer is zero, no collision has occurred. In Figure F.6, bucket 2 points to an overflow
bucket 3; buckets 0 and 1 have a 0 pointer to indicate that there have been no
collisions with these buckets yet.