From OpenSCADAWiki
In our example we will use the second method, for what in the "Elements list" field of the attribute inspector we introduce the following list and press "Ctrl" + "Enter":
line:(20|80):(100|20) line:(100|20):(180|80) line:(180|80):(100|140) line:(100|140):(20|80) line:(100|20):(100|140) line:(20|80):(180|80) line:(50|165):(100|140) line:(100|140):(150|165) line:(150|165):(50|165) fill:(20|80):(100|20):(180|80):(100|140) fill:(50|165):(100|140):(150|165)