Pick-A-Slam

If partners have shown possible slam strength but not agreed on the best suit and bidder does not have a strong preference, he can jump to 5N to ask partner to pick a slam. This implies that the bidder is not interested in a grand slam.

A jump bid of 5 of an agreed-upon trump suit, when the opponents have bid a suit, asks partner to bid slam with a control in that suit, with the possible exception of over an opening preempt.

See Manufactured Bid for a little twist on this.