A wall and crown knot is a decorative kind of rope button.

The original use of the knot was to put at the end of the ropes on either side of a gangway leading onto a ship as stoppers.

In the wall and crown knot they are tied in opposite directions.

in Verrill's book it is made from three-strand and crown strands doubled, in Ashley's book it is made from four-strand and crown strands tripled.

Even in Falconer's day standardized spelling and pronunciation had hardly been thought of...To tie a three-strand wall knot: Take one strand and bring it counterclockwise under the next strand.