Type refers to the way the dishwasher is built into the cabinet.
FW Freestanding, with a worktop (can generally be built-in as well).
BI Built-in – might not have top or side panels; must be enclosed and anchored to prevent it from tipping forward when fully loaded and dish racks are pulled out.
SI Semi-integrated – a built-in type that allows you to fit a panel to the door under the control fascia to match the rest of your kitchen cupboard doors.
FI Fully integrated – built-in with the whole front matching your kitchen and the controls inside the door.