(1) In large American type (especially Wurlitzer, Hope-Jones) organs, usually denoting the second keyboard from the top in a 4 manual organ; contains most of the 16ft. and 8ft. heavy brass complement, and a duplication (more or less, according to the elaborate unification) of all the tuned percussion instruments in the organ.

(2) The 16ft. extension of the tuba mirabilis.