Number 2 inside a green circle.
Original file by <a href="//commons.wikimedia.org/wiki/User:Ybsen_lucero" title="User:Ybsen lucero">User:Ybsen lucero</a>. SVG version by <a href="//commons.wikimedia.org/w/index.php?title=User:FedericoMP&amp;action=edit&amp;redlink=1" class="new" title="User:FedericoMP (page does not exist)">User:FedericoMP</a>
Own work based on <a href="//commons.wikimedia.org/wiki/File:Cametro_line_2.jpg" title="File:Cametro line 2.jpg">Image:Cametro line 2.jpg</a> by <a href="//commons.wikimedia.org/wiki/User:Ybsen_lucero" title="User:Ybsen lucero">User:Ybsen lucero</a>.