Panel Wire marker
Symbol placed on a line segment to represent a single (non cable) conductor. e.g.1 a wire run from 1 relay terminal to a push-button terminal, inside a panel. e.g.2 a copper bus bar.
Wire extension marker
The wire extension marker symbol is provided to indicate, graphically, that a conductor is continued on another sheet of a drawing set. Both extension markers and normal markers can cause Elecdes to assume continuity over multiple sheets.
The rules regarding the continuation of wires across sheets are described in the Ebase.
Wire Marker With Gap
You can place wire markers with gap to represent a single (non cable) conductor. They are wire marker symbols with the wire name in the middle and gap on both sides as shown in the figure below.

