Rect
From King Arthur's Gold Wiki
The recti type is used to create GUI elements among other things. There are two variances.
Method one uses a position2di and dimension2di argument. The dimension2di argument represents the width and the height;
recti rect ( position2di, dimension2di);
Method two uses two position2di arguments. The first being the upper left hand corner and the second being the lower right hand corner. ( needs clarification. )
recti rect ( position2di, position2di);