The use of 4NT to ask for the FIVE Aces and Queen of trumps (counting the K of trumps as an Ace).
Two versions are available commonly known as 3041 and 1430.
3041 shows club response as 3 or 0 and diamond response as 1 or 4.
1430 shows club response as 1 or 4 and diamond response as 3 or 0.
3041 (most common) responses are:
5♣ shows Three or Zero Ace values (3/0)
5♦ shows Four or One Ace values (4/1)
5♥ shows Two Ace values but no Q of trumps (2 minus Q of trumps)
5♠ shows Two Ace values and the Q of trumps (2 plus Q of trumps)
Asking for the Queen of trumps
If the response to the 4NT bid is 5♣ or 5♦, the person asking can still ask for the Q of trumps by bidding the next suit up the line.