Markers are arbitrary objects (or even groups of objects) that are attached to a path and are displayed as part of that path at some of its nodes (12.1 The Anatomy of a Path). A path can have three different types of markers on its start node, intermediate (mid) nodes, and the end node. Each copy of the marker is positioned at the node and rotated so as to follow the direction of the path at this node. The most common use of markers is for creating arrowheads in diagrams and flowcharts.
The bottom of the Stroke style tab in the Fill and Stroke dialog contains three large drop-down lists where you can select start, mid, and end markers for the selected paths.
Figure 9-9. Choosing markers for a path
These three lists show all the same markers ...