A good meta-agreement, IMO.
When Responder to a 1NT opening shows a two-suited hand, and Opener picks one, then Responder can indicate his shortness in a set agreement as to steps.
Step 1: low stiff
Step 2: high stiff
Step 3: low void
Step 4: high void
Step 5: no interest
Consider 1NT-P-3♦(majors)-P-3♥(hearts set). Responder can bid 3♠(1) for 5521, 3NT(2) for 5512, 4♣(3) for 5530, 4♦(4) for 5503, or 4♥(5) to sign off.
How about a transfer and then a minor? 1NT-P-2♦-P-2♥-P-3♦-P-3♥ works the same way. If Opener agrees diamonds in this sequence (4♦?), the same thing could work as well.
The same general principle might work in many other sequences. The key is that when one person shows a two-suited hand, and the other person agrees trumps by bidding the focus suit one level below game, shortness bids in steps can be bid through this meta-agreement. Of course, you want to know when shortness indication is more important and hence the partnership default, rather than cuebidding.