A single jump showing a singleton in the suit bid and primary support for partner.
![](https://bernardmageebridge.com/wp-content/uploads/2021/11/image-183.png)
Since a simple reverse of 2♦ would be forcing, West does not need 3♦ as a natural bid. Playing mini splinters, 3♦ shows a raise to 4♠ with a singleton diamond; 4♦ would denote a similar hand but with a void diamond.