The Exclusive Gateway is a "case" or a "switch" statement in BPMN 2.0. It is denoted as a diamond with an optional "X".
This Sparx Systems Enterprise Architect diagram shows a Task "Evaluate CM System" flowing into an Exclusive Gateway. From the Exclusive Gateway, a CM System is selected. Although the conditions for "Git" and "Subversion" aren't specified yet, there is a default "Ad Hoc" path identified. This is shown by the slash on the Sequence Flow between the Gateway and the Ad Hoc Activity.
|An Exclusive Gateway with a Default Path|
|Default conditionType on a Sequence Flow|
|Setting markerVisible for an Explicit "X" on the Exclusive Gateway|