The bodice of this garment has one dart in the waist.
This bodice is actually a 3-D version of the flat 1-Dart Bodice Block that is used on this website.
The Blocks are named Style A & Style B to differentiate the blocks from the other Styles (Style-01 to Style-44).
Flat Block vs Technical Flat
Figure 1: On the left is the 1-Dart Block, with the dart open . On the right is the Technical Flat of that block; a 3D representation with the dart closed. The blocks are always shown as half the body, as the basic pattern is symmetrical.